isochronaladj.

/ʌɪˈsɒkrənəl/

Forms: Also 1700s -cronal.

Etymology: < modern Latin isochronus (Leibniz), < Greek ἰσόχρονος equal in time ( < ἰσο- , iso- comb. form + χρόνος time) + -al suffix¹. Compare French isochrone (1703 in Hatzfeld and Darmesteter).

1. = isochronous adj. 1. †isochronal line [translating Latin linea isochrona (Leibniz, 1689)] , a curve in which a heavy body descends with uniform velocity, i.e. moving through equal spaces in equal times. Obsolete.

ΘΚΠ

the world > time > relative time > simultaneity or contemporaneousness > [adjective] > synchronized or isochronous

synchronical1660

synchronous1677

isochronal1680

isochron1697

isochronous1706

isochronic1780

isochronical1794

synchronal1876

synchronic1892

in-phase1914

synchronized1919

phased1929

1680 H. More Apocalypsis Apocalypseos 264 The Entireness of his Kingdom is Synchronal to the two Witnesses Prophesying in Sackcloth, they being both Isochronal, or of equal time.

1706 W. Jones Synopsis Palmariorum Matheseos 290 In a Medium that does not resist, the shorter Oscillations in a Cycloid are nearly Isocronal.

1794 G. Atwood in Philos. Trans. (Royal Soc.) 84 136 The isochronal property of spiral springs.

1838 Penny Cycl. XII. 298/2 The isochronal property which Galilei ascribed to the pendulum.

1866 W. T. Brande & G. W. Cox Dict. Sci., Lit. & Art (new ed.) II. 255/1 Isochronal axes, in Mechanics, axes around which, if a body be made to oscillate, the oscillations will be performed in equal times.

2. Of a line: connecting points at which a particular event occurs or occurred at the same time. Of a diagram: depicting such lines. Also as n., = isochron n. 2.

ΘΚΠ

the world > time > relative time > simultaneity or contemporaneousness > [adjective] > synchronized or isochronous > (of a line) connecting points on a diagram

isochronic1881

isochronal1926

the world > the earth > earth sciences > geography > map-making > map > [adjective] > line on map > simultaneous events

isochronal1926

1926 A. L. Thomson Probl. Bird-migration viii. 132 His [sc. Middendorff's] method was to plot out ‘isepipteses’, or isochronal lines, joining up all localities corresponding with each other as to their average dates for the arrival of particular summer visitors.

1937 D. Kennedy tr. A. Imamura Theoret. & Appl. Seismol. iv. 42 If a line is passed through places where a certain phase of the earthquake motion..appears simultaneously..a line resembling an isoseismal is obtained. It is the coseismal, or the isochronal of some recent writers.

1948 R. B. Hounsfield Traffic Surveys vi. 39 Another type of diagram used in planning is the ‘isochronal’ diagram.

1948 R. B. Hounsfield Traffic Surveys vi. 40 (caption) Isochronal diagram showing accessibility of different areas.

1962 C. D. Sherman tr. J. Dorst Migrations of Birds vii. 236 The influence of temperature, revealed in this parallelism between isochronal lines and isotherms, may be less apparent because of other factors which also govern migration.

Derivatives

iˈsochronally adv. = isochronously adv. at isochronous adj. Derivatives.

ΚΠ

1882 Ogilvie's Imperial Dict. (new ed.) Isochronally, so as to be isochronal.

This entry has not yet been fully updated (first published 1900; most recently modified version published online June 2022).

单词	isochronal
释义	isochronaladj. /ʌɪˈsɒkrənəl/ Forms: Also 1700s -cronal. Etymology: < modern Latin isochronus (Leibniz), < Greek ἰσόχρονος equal in time ( < ἰσο- , iso- comb. form + χρόνος time) + -al suffix¹. Compare French isochrone (1703 in Hatzfeld and Darmesteter). 1. = isochronous adj. 1. †isochronal line [translating Latin linea isochrona (Leibniz, 1689)] , a curve in which a heavy body descends with uniform velocity, i.e. moving through equal spaces in equal times. Obsolete. ΘΚΠ the world > time > relative time > simultaneity or contemporaneousness > [adjective] > synchronized or isochronous synchronical1660 synchronous1677 isochronal1680 isochron1697 isochronous1706 isochronic1780 isochronical1794 synchronal1876 synchronic1892 in-phase1914 synchronized1919 phased1929 1680 H. More Apocalypsis Apocalypseos 264 The Entireness of his Kingdom is Synchronal to the two Witnesses Prophesying in Sackcloth, they being both Isochronal, or of equal time. 1706 W. Jones Synopsis Palmariorum Matheseos 290 In a Medium that does not resist, the shorter Oscillations in a Cycloid are nearly Isocronal. 1794 G. Atwood in Philos. Trans. (Royal Soc.) 84 136 The isochronal property of spiral springs. 1838 Penny Cycl. XII. 298/2 The isochronal property which Galilei ascribed to the pendulum. 1866 W. T. Brande & G. W. Cox Dict. Sci., Lit. & Art (new ed.) II. 255/1 Isochronal axes, in Mechanics, axes around which, if a body be made to oscillate, the oscillations will be performed in equal times. 2. Of a line: connecting points at which a particular event occurs or occurred at the same time. Of a diagram: depicting such lines. Also as n., = isochron n. 2. ΘΚΠ the world > time > relative time > simultaneity or contemporaneousness > [adjective] > synchronized or isochronous > (of a line) connecting points on a diagram isochronic1881 isochronal1926 the world > the earth > earth sciences > geography > map-making > map > [adjective] > line on map > simultaneous events isochronal1926 1926 A. L. Thomson Probl. Bird-migration viii. 132 His [sc. Middendorff's] method was to plot out ‘isepipteses’, or isochronal lines, joining up all localities corresponding with each other as to their average dates for the arrival of particular summer visitors. 1937 D. Kennedy tr. A. Imamura Theoret. & Appl. Seismol. iv. 42 If a line is passed through places where a certain phase of the earthquake motion..appears simultaneously..a line resembling an isoseismal is obtained. It is the coseismal, or the isochronal of some recent writers. 1948 R. B. Hounsfield Traffic Surveys vi. 39 Another type of diagram used in planning is the ‘isochronal’ diagram. 1948 R. B. Hounsfield Traffic Surveys vi. 40 (caption) Isochronal diagram showing accessibility of different areas. 1962 C. D. Sherman tr. J. Dorst Migrations of Birds vii. 236 The influence of temperature, revealed in this parallelism between isochronal lines and isotherms, may be less apparent because of other factors which also govern migration. Derivatives iˈsochronally adv. = isochronously adv. at isochronous adj. Derivatives. ΚΠ 1882 Ogilvie's Imperial Dict. (new ed.) Isochronally, so as to be isochronal. This entry has not yet been fully updated (first published 1900; most recently modified version published online June 2022). < adj.1680
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