Top Definition
IN THEORY: Light speed is the rate of travel of light in an un-interupted vacuum. Exactly 299,792,458 metres per second (m/s), where metre is difined by 1983 Systeme International (SI) as "The length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second.". The theory of realitivity describes light speed as impassible in rate of travel, but this is based on the fact it hasn't been done yet *rolls eyes*.

However, Light Speed is acctually better told as such: The speed of light is the commonly used interval of time it takes for the green light to turn amber on a traffic light in South Essex, UK, or the time it takes for a traffic warden to travel from the end of the street to the parking spaces to give you a ticket as soon as you pull in.
Light speed is roughly equal to the speed light travels.
by regs_ October 27, 2004
The minigame in rubik's revolution in which you must press the correct light in time
R.R.: Light Speed.
Player: Ok, here we go.
via giphy
by A M80N8R May 27, 2016
The speed at which the car in front of you is traveling which assures you'll get caught by the upcoming traffic light.
Passenger: Do you think we'll make it through the upcoming green light before it changes?
Driver: Nope, the idiot in front of me is going light speed.
by Valet Parking Hater January 21, 2015
REAL FAST. The speed of light!
Imagine the speed of Superman, that is lightspeed!
by brendan July 01, 2004
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