round-offadj.n.

Brit.

/ˈraʊndɒf/, U.S.

/ˈraʊndˌɔf/,

/ˈraʊndˌɑf/

Origin: Formed within English, by conversion. Etymon: to round off at round v.² Phrasal verbs.

Etymology: < to round off at round v.² Phrasal verbs.

†A. adj.

Designating a half-round file with a pivot at the handle end, used esp. for rounding the teeth of small gearwheels. Obsolete.

ΘΚΠ

society > occupation and work > equipment > shaping tools or equipment > file > [adjective] > types of file

fine-toothed1601

round-off1801

cross-cut1827

superfine1872

double-cut-

1801 Bailey's Dict. Eng.-German & German-Eng. II. 639/2 Welsfeile, round-off file.

1846 C. Holtzapffel Turning & Mech. Manip. II. 826 Nicking and piercing files..are called round-off files, and are used for rounding or pointing the teeth of wheels.

1890 Special Consular Rep. (51st Congress H.R. Misc. Doc. 268) I. 259 The following is a list of the different kinds of files in use in this colony imported from England and Germany:..mill saw file, 8 to 16 inch; needle file, 8 to 16 inch; round-off file, 8 to 16 inch.

B. n.

a. The act of rounding something off (in various senses). Cf. to round off at round v.² Phrasal verbs.

ΘΚΠ

the world > space > shape > curvature > [noun] > action or process > so as not to be angular

rounding1562

arrondissement1743

round-off1891

1891 Ann. Rep. Public Schools Nova Scotia 64 As ‘a round-off’ to my visit, the united departments gave a pretty concert, the singing having the accompaniment of the piano.

1906 Auto 1 Sept. 1120/2 No more delightful spot can be imagined than Scarborough towards the end of September, when..the keen bracing air helps as a round off to the summer holidays.

1994 J. E. Powell Evol. Gospel 67 Luke then..inserted before Jesus' baptism, as a round-off to the potted biography of John (3.1–17), the passage [quoted].

2004 Tool & Machinery Catal. 2005 (Axminster Power Tool Centre Ltd.) v. 48/1 Profile C—for a shallower round off, use a cutter with a cutter diameter greater than the thickness of the work-piece.

b. An instance of rounding a number off; = rounding n.³ 8. Frequently attributive in round-off error.

ΘΚΠ

the mind > mental capacity > knowledge > conformity with what is known, truth > disregard for truth, falsehood > inaccuracy, inexactness > [noun] > in calculation > instance of > introduced by rounding

rounding-off error1935

rounding error1938

round-off error1946

1946 H. H. Goldstine & J. Von Neumann in J. Von Neumann Coll. Wks. (1963) V. i. 17 The accumulation and amplification of the round-off errors threatens to prevent the obtaining of results of the desired precision.

1962 Times Lit. Suppl. 20 Apr. 268/1 Approximations due to round-offs or other reasons are indicated.

1973 C. W. Gear Introd. Computer Sci. vi. 258 Sometimes a bad choice of method will make the solution very sensitive to round-off or truncation errors.

1999 Sci. Amer. Nov. 68/1 In a simulation, tiny truncation and round-off errors..are enough to set the time reversal awry.

2006 A. K. Escoe Piping & Pipeline Assessment Guide vii. 442 Because round-offs are required to convert to plate sizes in the English system, the interested reader may want to perform the computations in the English system.

2. Gymnastics. An exercise similar to a cartwheel, in which the gymnast closes his or her legs on reaching a vertical position, and executes a quarter turn to land with the back to the direction of travel. Also called Arab spring, (occasionally) Arabian spring.

ΘΚΠ

society > leisure > sport > types of sport or game > gymnastics > [noun] > actions or positions

vaulting1531

cross-step1728

still-vaulting1854

roll1858

trampolining1867

planche1878

handstand1890

rollover1891

trapezing1894

press1901

straddle1905

kip1909

upstart1909

headstand1915

round-off1917

neck-roll1920

undergrip1920

pike1928

swivel hips1943

thigh lift1949

overswing1955

shoulder stand1956

stand1956

floor exercise1957

squat1959

turnaround1959

salto1972

Tsukahara1972

1917 W. A. Stecher Theory & Pract. Educ. Gymnastics 45 Tumbling. Hand springs with assistance. Head stand. Hand stand. Round off. Head and hand spring.

1964 Trampolining (‘Know the Game’ Ser.) 40/1 It is similar in action to the round-off in ground work tumbling.

2006 Herald-Times (Bloomington, Indiana) 7 Aug. a3/3 She practices gymnastics twice a week with a private instructor. ‘I can do round offs pretty well.’

This entry has been updated (OED Third Edition, March 2011; most recently modified version published online March 2022).

单词	round-off
释义	round-offadj.n. Brit. /ˈraʊndɒf/, U.S. /ˈraʊndˌɔf/, /ˈraʊndˌɑf/ Origin: Formed within English, by conversion. Etymon: to round off at round v.² Phrasal verbs. Etymology: < to round off at round v.² Phrasal verbs. †A. adj. Designating a half-round file with a pivot at the handle end, used esp. for rounding the teeth of small gearwheels. Obsolete. ΘΚΠ society > occupation and work > equipment > shaping tools or equipment > file > [adjective] > types of file fine-toothed1601 round-off1801 cross-cut1827 superfine1872 double-cut- 1801 Bailey's Dict. Eng.-German & German-Eng. II. 639/2 Welsfeile, round-off file. 1846 C. Holtzapffel Turning & Mech. Manip. II. 826 Nicking and piercing files..are called round-off files, and are used for rounding or pointing the teeth of wheels. 1890 Special Consular Rep. (51st Congress H.R. Misc. Doc. 268) I. 259 The following is a list of the different kinds of files in use in this colony imported from England and Germany:..mill saw file, 8 to 16 inch; needle file, 8 to 16 inch; round-off file, 8 to 16 inch. B. n. 1. a. The act of rounding something off (in various senses). Cf. to round off at round v.² Phrasal verbs. ΘΚΠ the world > space > shape > curvature > [noun] > action or process > so as not to be angular rounding1562 arrondissement1743 round-off1891 1891 Ann. Rep. Public Schools Nova Scotia 64 As ‘a round-off’ to my visit, the united departments gave a pretty concert, the singing having the accompaniment of the piano. 1906 Auto 1 Sept. 1120/2 No more delightful spot can be imagined than Scarborough towards the end of September, when..the keen bracing air helps as a round off to the summer holidays. 1994 J. E. Powell Evol. Gospel 67 Luke then..inserted before Jesus' baptism, as a round-off to the potted biography of John (3.1–17), the passage [quoted]. 2004 Tool & Machinery Catal. 2005 (Axminster Power Tool Centre Ltd.) v. 48/1 Profile C—for a shallower round off, use a cutter with a cutter diameter greater than the thickness of the work-piece. b. An instance of rounding a number off; = rounding n.³ 8. Frequently attributive in round-off error. ΘΚΠ the mind > mental capacity > knowledge > conformity with what is known, truth > disregard for truth, falsehood > inaccuracy, inexactness > [noun] > in calculation > instance of > introduced by rounding rounding-off error1935 rounding error1938 round-off error1946 1946 H. H. Goldstine & J. Von Neumann in J. Von Neumann Coll. Wks. (1963) V. i. 17 The accumulation and amplification of the round-off errors threatens to prevent the obtaining of results of the desired precision. 1962 Times Lit. Suppl. 20 Apr. 268/1 Approximations due to round-offs or other reasons are indicated. 1973 C. W. Gear Introd. Computer Sci. vi. 258 Sometimes a bad choice of method will make the solution very sensitive to round-off or truncation errors. 1999 Sci. Amer. Nov. 68/1 In a simulation, tiny truncation and round-off errors..are enough to set the time reversal awry. 2006 A. K. Escoe Piping & Pipeline Assessment Guide vii. 442 Because round-offs are required to convert to plate sizes in the English system, the interested reader may want to perform the computations in the English system. 2. Gymnastics. An exercise similar to a cartwheel, in which the gymnast closes his or her legs on reaching a vertical position, and executes a quarter turn to land with the back to the direction of travel. Also called Arab spring, (occasionally) Arabian spring. ΘΚΠ society > leisure > sport > types of sport or game > gymnastics > [noun] > actions or positions vaulting1531 cross-step1728 still-vaulting1854 roll1858 trampolining1867 planche1878 handstand1890 rollover1891 trapezing1894 press1901 straddle1905 kip1909 upstart1909 headstand1915 round-off1917 neck-roll1920 undergrip1920 pike1928 swivel hips1943 thigh lift1949 overswing1955 shoulder stand1956 stand1956 floor exercise1957 squat1959 turnaround1959 salto1972 Tsukahara1972 1917 W. A. Stecher Theory & Pract. Educ. Gymnastics 45 Tumbling. Hand springs with assistance. Head stand. Hand stand. Round off. Head and hand spring. 1964 Trampolining (‘Know the Game’ Ser.) 40/1 It is similar in action to the round-off in ground work tumbling. 2006 Herald-Times (Bloomington, Indiana) 7 Aug. a3/3 She practices gymnastics twice a week with a private instructor. ‘I can do round offs pretty well.’ This entry has been updated (OED Third Edition, March 2011; most recently modified version published online March 2022). < adj.n.1801
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