or half life, half·life
How to use half-life in a sentence
Eric Garcetti succeeded Villaraigosa and has received high marks in his first year and a half on the job.The Golden State Preps for the ‘Red Wedding’ of Senate Races|David Freedlander|January 9, 2015|DAILY BEAST
His life as a man is built around health insurance and tax services.Houellebecq’s Incendiary Novel Imagines France With a Muslim President|Pierre Assouline|January 9, 2015|DAILY BEAST
It was also an attack on our freedom of expression and way of life.Politicians Only Love Journalists When They're Dead|Luke O’Neil|January 8, 2015|DAILY BEAST
I always wanted my life to be that way, and it became that way.Coffee Talk with Fred Armisen: On ‘Portlandia,’ Meeting Obama, and Taylor Swift’s Greatness|Marlow Stern|January 7, 2015|DAILY BEAST
My dad was a sailor, and all through my childhood he was away half of the time at sea, and to an extent I have a similar job.Belle & Sebastian Aren’t So Shy Anymore|James Joiner|January 7, 2015|DAILY BEAST
It is the principal waste-product of metabolism, and constitutes about one-half of all the solids excreted—about 30 gm.A Manual of Clinical Diagnosis|James Campbell Todd
A small book, bound in full purple calf, lay half hidden in a nest of fine tissue paper on the dressing-table.
Now, it immediately occurred to Davy that he had never in his whole life had all the plums he wanted at any one time.Davy and The Goblin|Charles E. Carryl
Hilda, trembling at the door, more than half expected Mr. Orgreave to say: "You mean, she's invited herself."
Dean Swift was indeed a misanthrope by theory, however he may have made exception to private life.Gulliver's Travels|Jonathan Swift
British Dictionary definitions for half-life
Scientific definitions for half-life
Cultural definitions for half-life
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.