half-life
- n the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance to disintegrate)
- Its "half-life" (the period during which one half disintegrates) is only five months.
- Cheung is 44, and if he has changed at all during his half-life in the public eye, it is to become more wily in the lavishing and husbanding of his allure.
- The two celebrities with the longest online half-life are Marilyn Monroe (47th most popular celebrity search) followed by Elvis Presley (in position #101).