Half Life

1 : the time required for half of something to undergo a process: as a : the time required for half of the atoms of a radioactive substance to become disintegrated b : the time required for half the amount of a substance (as a drug or radioactive tracer) in or introduced into a living system or ecosystem to be eliminated or disintegrated by natural processes
2 : a period of usefulness or popularity preceding decline or obsolescence <slang usually has a short half-life>

For americium-241, it is known that half of the atoms decay in 458 years. Therefore, 458 years is the half-life of americium-241. Every radioactive element has a different half-life, ranging from fractions of a second to millions of years, depending on the specific isotope. For example, americium-243 has a half-life of 7,370 years.

by Mark January 6, 2004

Half-Life 2

1. The sign that our Lord and Savior is coming, and he favors gamers.
2. The absolute BEST... GAME... EVER...

People who hate this game are: 1. Satan 2. Lieberman 3. Satan Wanna-Be's

Half-Life 2 was the most amazing thing I have ever played. It excels at everything. Nothing can stand against it.

On an unrelated note, I need a fresh pair of undies...

by Is not trying to build a Strider... December 31, 2004

Half-Life 2

The sequel to the best-selling Half-Life, which was released for the PC and Playstation 2. A game developed by the company VALVe, it was due out in September of '03, until the script code was stolen. The FBI has joined in the hunt to find the stolen source code. VALVe is hoping to have this game out before Holidays of 2004, but it may be early 2005 before we see the light of it.

Half-Life was a great game, and Half-Life 2 will be even better, with increased graphics, new enemies, and new weapons.

by chaosKahn February 24, 2004

half boyfriend

A guy who is being used for sex and money. Not to be confused with 'friends with benefits'. In this case, the girl expects to be taken out to dinner, bars etc, but takes time off to hook up with other guys.

Girl: "you're like.. my half boyfriend"
Guy: "F that.."

by Jesse cali September 3, 2005

half again

One and-a-half times as much as something.

"Indeed, the first year of the office's ad campaign, ABC grabbed nearly $30 million worth, half again as much as Fox, its nearest rival at $20 million."

Source: Article on US Gov't Pot Propaganda

by Adam Laughlin September 22, 2005

half-struck one o'clock

Term used in the North of England to denote a lack of mental capacity. One of a genre of epithets signifying that a person is 'not all there'.

By 'eck, that cousin of yours acts half-struck one o'clock.
It isn't an act. She really is thick.

by Jim44 September 24, 2005

halfanese

anyone of mixed racial heritage with one asian parent.

musician julian lennon, the son of british former beatle john lennon and japanese artist yoko ono, is a halfanese celebrity. so was deceased actor brandon lee, son of martial arts superstar bruce lee and american teacher linda lee caldwell.

by aarrgghh May 28, 2010