half-life

/ˌhæf ˈlaɪf/
IPA guide

Definitions of half-life
  1. noun
    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)
    synonyms: half life
    see moresee less
    type of:
    period, period of time, time period
    an amount of time
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