lightlikeadj.

Brit.

/ˈlʌɪtlʌɪk/, U.S.

/ˈlaɪtˌlaɪk/

Origin: Formed within English, by derivation. Etymons: light n.¹, -like suffix.

Etymology: < light n.¹ + -like suffix. Compare earlier space-like adj., time-like adj.

Physics.

Resembling light; spec. designating an interval (interval n. 2c) between two points in space-time that is neither time-like nor space-like; relating to such an interval.For any given point in space-time, the set of all lightlike intervals forms a boundary (the light cone) between events that are causally connected with that point and ones that are not causally connected with it. Cf. space-like adj., time-like adj.

ΚΠ

1922 Trans. Kansas Acad. Sci. 1919–21 30 370 As there are soundlike vibrations which are inaudible, so there are many waves of lightlike vibrations which are invisible.

1946 N. E. Fremberg Stud. Generalized Hyperbolic Potentials i. 10 The vector u is called time-like, light-like, or space-like... A light-like vector is orthogonal to itself.

1960 P. Roman Theory Elem. Particles i. 38 The points of the lightcone are separated from the origin by light-like intervals.

2005 M. Lockwood Labyrinth of Time (2007) ii. 46 A curve is said to be null and lightlike if, in the vicinity of every event on the curve, it lies on the light-cone centred on that event.

This entry has been updated (OED Third Edition, December 2021).

单词	lightlike
释义	lightlikeadj. Brit. /ˈlʌɪtlʌɪk/, U.S. /ˈlaɪtˌlaɪk/ Origin: Formed within English, by derivation. Etymons: light n.¹, -like suffix. Etymology: < light n.¹ + -like suffix. Compare earlier space-like adj., time-like adj. Physics. Resembling light; spec. designating an interval (interval n. 2c) between two points in space-time that is neither time-like nor space-like; relating to such an interval.For any given point in space-time, the set of all lightlike intervals forms a boundary (the light cone) between events that are causally connected with that point and ones that are not causally connected with it. Cf. space-like adj., time-like adj. ΚΠ 1922 Trans. Kansas Acad. Sci. 1919–21 30 370 As there are soundlike vibrations which are inaudible, so there are many waves of lightlike vibrations which are invisible. 1946 N. E. Fremberg Stud. Generalized Hyperbolic Potentials i. 10 The vector u is called time-like, light-like, or space-like... A light-like vector is orthogonal to itself. 1960 P. Roman Theory Elem. Particles i. 38 The points of the lightcone are separated from the origin by light-like intervals. 2005 M. Lockwood Labyrinth of Time (2007) ii. 46 A curve is said to be null and lightlike if, in the vicinity of every event on the curve, it lies on the light-cone centred on that event. This entry has been updated (OED Third Edition, December 2021). < adj.1922
随便看	tool-pusher tool-rack tool-rest tool-roll tool-room tool-seller tool-shed tool-shop tool-stack tool-stay tool-stock tool-stone tool-tray tool-user tool-using toolache toolache wallaby toolate toolateness toolbar toolbars toolbasket toolbox toolboxes toolbudget