Noun (physics terminology): the natural sequential relation between any cause and its subsequent effect in the known universe, in which any effect is invariably preceded by the cause of that effect, and never the reverse.
"Newton's Third Law of Motion is essentially a confirmation of the principle of causality."
A legend in Counter-Strike: Source, known for beating the odds while in a 12 on 12 tournament. He was the last one left against 11 enemies, and he ended up finishing them all off by himself with a Glock Pistol.
Causality is a god in Counter-Strike: Source, and if you see him, RUN!