Meaning of half-life
Pronunciation: (haf'līf", häf'-), [key]
— pl. -lives
- the time required for one half the atoms of a given amount of a radioactive substance to disintegrate.
- the time required for the activity of a substance taken into the body to lose one half its initial effectiveness.
- a brief period during which something flourishes before dying out.
- half-life (Thesaurus)