nutationn.

Brit.

/njuːˈteɪʃn/,

/njᵿˈteɪʃn/, U.S.

/n(j)uˈteɪʃ(ə)n/

Origin: A borrowing from Latin. Etymons: Latin nūtātiōn-, nūtātiō.

Etymology: < classical Latin nūtātiōn-, nūtātiō nodding < nūtāt- , past participial stem of nūtāre to nod (see nutant adj.) + -iō -ion suffix¹. Compare French nutation (1749 in sense 2, 1751 in sense 1, 1758 in sense 3). N.E.D. (1907) gives only the pronunciation (niutēⁱ·ʃən) /njuːˈteɪʃən/.

†a. The action of nodding the head, esp. as a sign of drowsiness; an instance of this. Also in extended use. Obsolete.

ΘΚΠ

the world > physical sensation > sleeping and waking > sleep > [noun] > nodding in sleep

nodding1548

nutation1612

niddy-noddy1653

1612 J. Cotta Short Discouerie Dangers Ignorant Practisers Physicke i. v. 42 The nutation and staggering of nature doth make warie proceeding.

1656 T. Blount Glossographia Nutation, nodding, as one doth when he sits sleeping.

1724 E. Ward Merry Travellers i, in Wandring Spy 46 A Country Walk is good To breathe your Lungs and stir your Blood, And carry off, by Perspiration, Nutritious Juices that occasion That drowsy Humour of Nutation.

1728 A. Pope Dunciad ii. 363 So from the mid-most the nutation spreads Round, and more round, o'er all the sea of heads.

1859 J. G. Saxe Richard of Gloster in Poet. Wks. (1889) 241 Ugly relations, Who'll be very apt to disturb your nutations By unpleasant allusions, and rude observations!

1897 T. C. Allbutt et al. Syst. Med. III. 78 The cervical vertebræ are usually attacked first; a difficulty is felt in rotation and nutation.

b. Obstetrics and Physiology. Tilting of the sacrum relative to the iliac bones, resulting in movement of the apex of the sacrum and the tip of the coccyx posteriorly.

ΚΠ

1868 J. M. Duncan Res. Obstetrics ii. v. 147 (heading) Nutation of sacrum.

1886 A. L. Galabin Man. Midwifery i. 10 (caption) Nutation of the sacrum during parturition.

1896 Brit. Med. Jrnl. 31 Oct. 1292/1 Matthews Duncan described this ‘nutation’ of the sacrum.

1949 Blakiston's New Gould Med. Dict. 682/1 Nutation,..nodding or oscillation, as nutation of the sacrum, a partial rotation of the sacrum on its transverse axis.

1974 L. H. Honoré tr. I. A. Kapandji Physiol. Joints III. 64 During the movement of nutation..the sacrum rotates about an axis constituted by the axial ligament.

1999 C. Stone Sci. in Art of Osteopathy vii. 169/2 Nutation and counternutation are not the only directions of sacral (and therefore pelvic) movement.

a. Mechanics and Astronomy. An oscillation of the axis of a rotating object; spec. the periodic variation of the inclination of the earth's axis which causes the precession of the poles to follow a wavy rather than a circular path.

ΘΚΠ

the world > the earth > geodetic references > [noun] > pole > axis > movement

nutation1703

pendulation1908

polar wandering1909

polar wander1957

the world > movement > motion in specific manner > alternating or reciprocating motion > oscillation > [noun] > oscillation of a spinning top

nutation1879

1703 Philos. Trans. 1702–3 (Royal Soc.) 23 1315 It is the more likely, that this variation of the Stars distance from the Pole..proceeds from some nutation.

1715 tr. D. Gregory Elements Astron. I. iii. §55. 502 Yet another Nutation arising from another cause may produce all this diversity in the distance of the Pole-Star from the Pole.

1748 Philos. Trans. (Royal Soc.) 45 13 This apparent Motion, in both those Stars, might proceed from a Nutation in the Earth's Axis.

1789 E. Darwin Bot. Garden: Pt. II ii. 63 Marking her solar and sidereal day, Her slow nutation, and her varying clime.

1842 Penny Cycl. XXII. 448/1 A large number of stars..have a slight apparent motion not attributable either to precession or nutation.

1879 W. Thomson & P. G. Tait Treat. Nat. Philos. (new ed.) I: Pt. i. §107 If a Troughton's top be placed on its pivot in any inclined position, and then spun off with very great angular velocity about its axis of figure, the nutation will be insensible.

1882 R. A. Proctor in Knowledge 220 A more perfect method of illustrating the precession of the equinoxes or the earth's reeling, and also the nutation (or nodding, still to be described).

1945 C. E. Balleisen Princ. Firearms App. A. 135 If the motion of a stable projectile is examined..it will be found that the yaw does not diminish smoothly, but rather by a sort of looping motion. Further, the direction in which the bullet points will rotate about the trajectory. These phenomena are known as nutation and precession and are similar in nature to astronomical phenomena bearing the same names.

1980 R. D. Bent & J. L. McKinley Aircraft Maintenance & Repair (ed. 4) xiv. 486/1 Nutation requires no external torque to sustain it.

1991 Science 22 Mar. 1443/2 Modeling of the Earth's forced nutations..suggests the presence of an electromagnetic coupling between the mantle and core.

b. Rotation of an axis (of a radar beam, aerial, etc.) so as to describe a cone. Now rare.Analogous to precession (precession n.² 1b) rather than to nutation (sense 2a).

ΘΚΠ

the world > movement > motion in specific manner > revolution or rotation > [noun] > spinning > of axis or body in sloping position

precession1879

nutation1947

1947 Bell Syst. Techn. Jrnl. 26 307 The axis of the beam was rotated in an orbit by ‘nutation’ about the mechanical axis of the antenna.

1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) XI. 204/2 Either the feed or the reflector whirls rapidly in a manner that causes the beam axis to describe a circular cone; this motion of the beam axis is called nutation.

3. Botany. Bending or directional movement of a plant stem or root, spec. when caused by variation in the rate of growth on different sides of the organ; a movement of this kind. Cf. circumnutation n.

ΘΚΠ

the world > plants > part of plant > growth, movement, or curvature of parts > [noun] > torsion or nutation

intorsion1760

resupination1760

nutation1789

torsion1875

circumnutation1880

1789 E. Darwin Bot. Garden: Pt. II ii. 19 The sun flower follows the course of the sun by nutation, not by twisting its stem.

1816 P. Keith Syst. Physiol. Bot. II. 447 Such flowers are designated by the appellation of Heliotropes, on account of their following the course of the sun; and the movement they thus exhibit is denominated their nutation.

1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. iii. iv. 766 Curvatures..caused by the unequal growth of different sides of an organ may be called Nutations..It is common for the apices of erect stems above the curved growing part to move round in a circle or ellipse, the region of most active growth moving gradually, as it were, round the axis. This kind of nutation may be termed a Revolving Nutation.

1910 Bot. Gaz. 50 317 Light of such intensity can be chosen that..its joint action with gravity will, after various nutations, lead to the epicotyl permanently growing in the horizontal position.

1941 Amer. Jrnl. Bot. 28 91/1 It will be seen how in this way minor irregularities due to nutations are practically ruled out, especially when enough reactions were available to calculate a satisfactory mean.

1976 P. Bell & D. Coombe tr. Strasburger's Textbk. Bot. (new ed.) 372 The actual twining..is a very complex process, involving not only autonomic nutation of the shoot but also irritability movements, gravity being an important factor.

2003 Cellular & Molecular Biol. Lett. 8 31 Our results confirm the involvement of electrical potential changes in the mechanism of stem nutations.

This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022).

单词	nutation
释义	nutationn. Brit. /njuːˈteɪʃn/, /njᵿˈteɪʃn/, U.S. /n(j)uˈteɪʃ(ə)n/ Origin: A borrowing from Latin. Etymons: Latin nūtātiōn-, nūtātiō. Etymology: < classical Latin nūtātiōn-, nūtātiō nodding < nūtāt- , past participial stem of nūtāre to nod (see nutant adj.) + -iō -ion suffix¹. Compare French nutation (1749 in sense 2, 1751 in sense 1, 1758 in sense 3). N.E.D. (1907) gives only the pronunciation (niutēⁱ·ʃən) /njuːˈteɪʃən/. 1. †a. The action of nodding the head, esp. as a sign of drowsiness; an instance of this. Also in extended use. Obsolete. ΘΚΠ the world > physical sensation > sleeping and waking > sleep > [noun] > nodding in sleep nodding1548 nutation1612 niddy-noddy1653 1612 J. Cotta Short Discouerie Dangers Ignorant Practisers Physicke i. v. 42 The nutation and staggering of nature doth make warie proceeding. 1656 T. Blount Glossographia Nutation, nodding, as one doth when he sits sleeping. 1724 E. Ward Merry Travellers i, in Wandring Spy 46 A Country Walk is good To breathe your Lungs and stir your Blood, And carry off, by Perspiration, Nutritious Juices that occasion That drowsy Humour of Nutation. 1728 A. Pope Dunciad ii. 363 So from the mid-most the nutation spreads Round, and more round, o'er all the sea of heads. 1859 J. G. Saxe Richard of Gloster in Poet. Wks. (1889) 241 Ugly relations, Who'll be very apt to disturb your nutations By unpleasant allusions, and rude observations! 1897 T. C. Allbutt et al. Syst. Med. III. 78 The cervical vertebræ are usually attacked first; a difficulty is felt in rotation and nutation. b. Obstetrics and Physiology. Tilting of the sacrum relative to the iliac bones, resulting in movement of the apex of the sacrum and the tip of the coccyx posteriorly. ΚΠ 1868 J. M. Duncan Res. Obstetrics ii. v. 147 (heading) Nutation of sacrum. 1886 A. L. Galabin Man. Midwifery i. 10 (caption) Nutation of the sacrum during parturition. 1896 Brit. Med. Jrnl. 31 Oct. 1292/1 Matthews Duncan described this ‘nutation’ of the sacrum. 1949 Blakiston's New Gould Med. Dict. 682/1 Nutation,..nodding or oscillation, as nutation of the sacrum, a partial rotation of the sacrum on its transverse axis. 1974 L. H. Honoré tr. I. A. Kapandji Physiol. Joints III. 64 During the movement of nutation..the sacrum rotates about an axis constituted by the axial ligament. 1999 C. Stone Sci. in Art of Osteopathy vii. 169/2 Nutation and counternutation are not the only directions of sacral (and therefore pelvic) movement. 2. a. Mechanics and Astronomy. An oscillation of the axis of a rotating object; spec. the periodic variation of the inclination of the earth's axis which causes the precession of the poles to follow a wavy rather than a circular path. ΘΚΠ the world > the earth > geodetic references > [noun] > pole > axis > movement nutation1703 pendulation1908 polar wandering1909 polar wander1957 the world > movement > motion in specific manner > alternating or reciprocating motion > oscillation > [noun] > oscillation of a spinning top nutation1879 1703 Philos. Trans. 1702–3 (Royal Soc.) 23 1315 It is the more likely, that this variation of the Stars distance from the Pole..proceeds from some nutation. 1715 tr. D. Gregory Elements Astron. I. iii. §55. 502 Yet another Nutation arising from another cause may produce all this diversity in the distance of the Pole-Star from the Pole. 1748 Philos. Trans. (Royal Soc.) 45 13 This apparent Motion, in both those Stars, might proceed from a Nutation in the Earth's Axis. 1789 E. Darwin Bot. Garden: Pt. II ii. 63 Marking her solar and sidereal day, Her slow nutation, and her varying clime. 1842 Penny Cycl. XXII. 448/1 A large number of stars..have a slight apparent motion not attributable either to precession or nutation. 1879 W. Thomson & P. G. Tait Treat. Nat. Philos. (new ed.) I: Pt. i. §107 If a Troughton's top be placed on its pivot in any inclined position, and then spun off with very great angular velocity about its axis of figure, the nutation will be insensible. 1882 R. A. Proctor in Knowledge 220 A more perfect method of illustrating the precession of the equinoxes or the earth's reeling, and also the nutation (or nodding, still to be described). 1945 C. E. Balleisen Princ. Firearms App. A. 135 If the motion of a stable projectile is examined..it will be found that the yaw does not diminish smoothly, but rather by a sort of looping motion. Further, the direction in which the bullet points will rotate about the trajectory. These phenomena are known as nutation and precession and are similar in nature to astronomical phenomena bearing the same names. 1980 R. D. Bent & J. L. McKinley Aircraft Maintenance & Repair (ed. 4) xiv. 486/1 Nutation requires no external torque to sustain it. 1991 Science 22 Mar. 1443/2 Modeling of the Earth's forced nutations..suggests the presence of an electromagnetic coupling between the mantle and core. b. Rotation of an axis (of a radar beam, aerial, etc.) so as to describe a cone. Now rare.Analogous to precession (precession n.² 1b) rather than to nutation (sense 2a). ΘΚΠ the world > movement > motion in specific manner > revolution or rotation > [noun] > spinning > of axis or body in sloping position precession1879 nutation1947 1947 Bell Syst. Techn. Jrnl. 26 307 The axis of the beam was rotated in an orbit by ‘nutation’ about the mechanical axis of the antenna. 1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) XI. 204/2 Either the feed or the reflector whirls rapidly in a manner that causes the beam axis to describe a circular cone; this motion of the beam axis is called nutation. 3. Botany. Bending or directional movement of a plant stem or root, spec. when caused by variation in the rate of growth on different sides of the organ; a movement of this kind. Cf. circumnutation n. ΘΚΠ the world > plants > part of plant > growth, movement, or curvature of parts > [noun] > torsion or nutation intorsion1760 resupination1760 nutation1789 torsion1875 circumnutation1880 1789 E. Darwin Bot. Garden: Pt. II ii. 19 The sun flower follows the course of the sun by nutation, not by twisting its stem. 1816 P. Keith Syst. Physiol. Bot. II. 447 Such flowers are designated by the appellation of Heliotropes, on account of their following the course of the sun; and the movement they thus exhibit is denominated their nutation. 1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. iii. iv. 766 Curvatures..caused by the unequal growth of different sides of an organ may be called Nutations..It is common for the apices of erect stems above the curved growing part to move round in a circle or ellipse, the region of most active growth moving gradually, as it were, round the axis. This kind of nutation may be termed a Revolving Nutation. 1910 Bot. Gaz. 50 317 Light of such intensity can be chosen that..its joint action with gravity will, after various nutations, lead to the epicotyl permanently growing in the horizontal position. 1941 Amer. Jrnl. Bot. 28 91/1 It will be seen how in this way minor irregularities due to nutations are practically ruled out, especially when enough reactions were available to calculate a satisfactory mean. 1976 P. Bell & D. Coombe tr. Strasburger's Textbk. Bot. (new ed.) 372 The actual twining..is a very complex process, involving not only autonomic nutation of the shoot but also irritability movements, gravity being an important factor. 2003 Cellular & Molecular Biol. Lett. 8 31 Our results confirm the involvement of electrical potential changes in the mechanism of stem nutations. This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022). < n.1612
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