Half-Life is a revolutionary game for computer; more need not be said.

An element's half life is the period of time it takes for half of the radioactive isotopes to decay. It is ibnot/b/i used to describe the dissapation of something not radioactive(subliminal hintcaffeine for instance /subliminal hint)
Random_Gaming_Publication: And our game of the year award goes to... Half-Life
The_rest_of_the_word: ... really? *yawn*

Random_Chem_1_teacher: The radioactive half-life of carbon60 is approximately 6000 years.
by opium April 30, 2003
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a great pc game or,
going half life is beating the sh*t out of some one with a crowbar
"i'm going to go play half life"

"i'm going to go half life on your ass"
by captain bernard July 22, 2008
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The half life of a radioisotope is the time taken for the current level of radioactivity to drop to half that amount. Note that this means radioactive decay follows the curve of a decaying exponential. Oh, as mentioned, it is also somewhat of a revolutionary computer game. "As for the suit, I think you've earned it"
Carbon-14 has a half-life of 5,730 years. Let's say its radioactivity 'level' at time = 0 is 2. After around 5,730, its radioactivity will be 1, After a further 5,370 years its radioactivity will be 0.5, and after yet another half life, the radioactivty would be 0.25, and so on.
by Chavez77 June 22, 2006
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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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A very good computer game that gets abused by HALO zombies. Basic single player owns. Got lots of addictive mods.
Half-Life owns. And Half-Life 2 will own HALO2
by Gungsta-Pasta August 04, 2003
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One of the most addictive games after Counter-strike and World of warcraft.most of the players are individuals from 5 years to 25 years old and are those who play up to 8 hours a day are called ironiclly "half-lifers" because they have a"half-life" by playing that long.
Dude 1: hey what are you doing?
Dude2:nothing, playing half-life
Dude 1: how long?
Dude 2: 9 HOURS STRAIGHT
Dude 1: you such a half-lifer
by miles949 July 04, 2009
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