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单词 subtention
释义

subtentionn.

Brit. /ˌsʌbˈtɛnʃn/, /ˈsʌbˌtɛnʃn/, U.S. /ˌsəbˈtɛn(t)ʃ(ə)n/
Origin: A borrowing from Latin, combined with an English element. Etymons: Latin subtent- , subtendere , -ion suffix1.
Etymology: < classical Latin subtent-, past participial stem of subtendere subtend v. + -ion suffix1. Compare post-classical Latin subtentio (1525 or earlier in medical context, translating ancient Greek ὑπότασις ). Compare slightly later subtense n.
Geometry.
= subtense n.In quot. 1610: a straight line in relation to a circle (such as a chord or a tangent).
ΘΚΠ
the world > relative properties > number > geometry > line > [noun] > chord
cord1551
chord1570
string1594
subtention1610
subtense1614
ordinate1676
inscript1695
supplemental chord1760
string-line1897
1610 A. Hopton Baculum Geodæticum vii. ii. 297 Any right lines being applied to a circle is called a subtention, which may be Sines, Tangents, or Secants.
1888 W. M. F. Petrie Season Egypt, 1887 vi. 28/1 The actual adjustments required to reconcile the observations, are..an average change in the angles of subtention of the measured bases of 1'2'' on each azimuth.
1915 H. Ommundsen & E. H. Robinson Rifles & Ammunition i. xiii. 211 Subtract the elevation of the intermediate range from the elevation of the full range, and multiply the remainder by 1.047 (the subtention of 1 in. of angle) and by the number of hundreds of yards.
2002 W. van Zwoll Hunter's Guide Accurate Shooting (2004) xiv. 162 You just have to do some shooting with your load at various ranges to check subtention and bullet impact relative to the bars.
This entry has been updated (OED Third Edition, June 2012; most recently modified version published online March 2022).
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n.1610
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