or half life, half·life
noun, plural half-lives [haf-lahyvz, hahf-] /ˈhæfˌlaɪvz, ˈhɑf-/.
Origin of half-life
Examples from the Web for half-life
Contemporary Examples of half-life
The half-life of a piece of technology these days is very short.ecoATM offers consumers a new way to sell used cell phones and electronic devices
September 1, 2013
But the half-life of a piece of hardware is very short these days.The BlackBerry’s Death Rattle Gets Louder
August 12, 2013
Historical Examples of half-life
She places herself as his equal—as the other half, without which his half-life cannot be complete.What a Young Husband Ought to Know
In the compartments on the ceiling, the figures are the size of life—in those round the walls, half-life size.
The half-life must find its mate or, after a few brief days, it dies, leaving its line extinct.Woman in Modern Society
The latter has a half-life of only 8.8 minutes and so counting must begin soon after the irradiation.The Atomic Fingerprint
Now the old problem of half-life is taking its toll, and we cant even hope to keep up with the birth rate any more.They Also Serve
Donald E. Westlake
also halflife, half life, 1864, with meaning "unsatisfactory way of living;" the sense in physics, "amount of time it takes half a given amount of radioactivity to decay" is first attested 1907.
In physics, a fixed time required for half the radioactive nuclei in a substance to decay. Half-lives of radioactive substances can range from fractions of a second to billions of years, and they are always the same for a given nucleus, regardless of temperature or other conditions. If an object contains a pound of a radioactive substance with a half-life of fifty years, at the end of that time there will be half a pound of the radioactive substance left undecayed in the object. After another fifty years, a quarter-pound will be left undecayed, and so on.