2 definitions by Kupo

Top Definition
1. The length of time needed for half the atoms of a radioactive isotope sample to decay
2. A sweet game
We are learning about Half-Lifes in Science.

I pwn at Half-life 2.
by Kupo December 21, 2004

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The number proceeding two but before three.
10...9...8...7...6...5...4...3.wait whats after three? Oh yeah, mord, 2...1...0...umm...what now?
by Kupo December 05, 2003

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