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Half-Life 

A game.

More specifically, a mind-control device that causes anyone who plays it to begin dissing Halo for no good reason.
We must save them before it is too late.
Half-Life by Cortana Dragoon July 15, 2005

Half-life 

1. The time taken for the radioactivity of a specified isotope to fall to half its original value. the time required for any specified property (e.g. the concentration of a substance in the body) to decrease by half.
2. One of the best video games you could ever play along with Portal.
Scenario1: "Iodine-131 has a Half-life of 8.1 days"
Scenario2: I love Half-life, the story and gameplay is just mind blowing!
Half-life by Zach T. Radass December 19, 2022

half-life 

great fucking game made by valve in 1999 I think
I play half-life
I do too
half-life by Unknown07724 January 8, 2025

Half-Life 

the coolest game ever made by valve and it was there first game and it was awsum and cool
u shud play Half-Life it is best gamd ever
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.
half life by opium April 30, 2003
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"
half life by captain bernard August 18, 2008