subluminaladj.

Brit.

/ˌsʌbˈl(j)uːmᵻnl/, U.S.

/ˌsəbˈlumən(ə)l/

Origin: Formed within English, by derivation. Etymons: sub- prefix, luminal adj.

Etymology: < sub- prefix + luminal adj.

Physics.

Less rapid than the speed of light.

ΘΚΠ

the world > movement > rate of motion > [adjective] > at speed of light > greater or less than the speed of light

superluminal1959

subluminal1967

1967 J. F. McKenzie in Proc. Physical Soc. 91 540 If the velocity of translation is less than the speed of electromagnetic waves propagating along the optic axis, i.e. β < β_‖ (which situation we shall refer to as subluminal).

1969 Physics Today May 45/3 Particles traveling at subluminal and those traveling at luminal velocities are two entirely distinct kinds of objects.

1980 Sci. Amer. Aug. 76/2 The expansion that appears from the earth to be superluminal would be relativistic but still subluminal when measured by the slower clocks of the source itself.

2007 C. R. Kitchin Galaxies in Turmoil 155 Material that is actually traveling at the subluminal velocity of 0.9c.

This entry has been updated (OED Third Edition, June 2012; most recently modified version published online March 2022).

单词	subluminal
释义	subluminaladj. Brit. /ˌsʌbˈl(j)uːmᵻnl/, U.S. /ˌsəbˈlumən(ə)l/ Origin: Formed within English, by derivation. Etymons: sub- prefix, luminal adj. Etymology: < sub- prefix + luminal adj. Physics. Less rapid than the speed of light. ΘΚΠ the world > movement > rate of motion > [adjective] > at speed of light > greater or less than the speed of light superluminal1959 subluminal1967 1967 J. F. McKenzie in Proc. Physical Soc. 91 540 If the velocity of translation is less than the speed of electromagnetic waves propagating along the optic axis, i.e. β < β_‖ (which situation we shall refer to as subluminal). 1969 Physics Today May 45/3 Particles traveling at subluminal and those traveling at luminal velocities are two entirely distinct kinds of objects. 1980 Sci. Amer. Aug. 76/2 The expansion that appears from the earth to be superluminal would be relativistic but still subluminal when measured by the slower clocks of the source itself. 2007 C. R. Kitchin Galaxies in Turmoil 155 Material that is actually traveling at the subluminal velocity of 0.9c. This entry has been updated (OED Third Edition, June 2012; most recently modified version published online March 2022). < adj.1967
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