Akademik
speed of light
noun
The
speed
of
electromagnetic radiation
in a perfect
vacuum
: exactly 299,792,458 metres per
second
.
Syn
:
Einstein barrier
, Einstein constant,
lightspeed
,
light speed
, c
See Also:
subluminal
,
tardyon
,
luxon
,
tachyon
, faster-than-c,
faster-than-light
, FTL,
superluminal
Wikipedia foundation
.