Definition of light-like in English:

light-like

adjective

Physics
  • Resembling light; specifically designating an interval between two points in space-time that is neither time-like nor space-like; relating to such an interval.

Origin

1920s; earliest use found in Transactions of the Kansas Academy of Science. From light + -like.

Pronunciation

light-like

/ˈlʌɪtlʌɪk/