Half-life Definition

hăflīf, häf-
half-lives
noun
The constant time period required for the disintegration of half of the atoms in a sample of some specific radioactive substance.
Webster's New World
The time required for half the quantity of a drug or other substance deposited in a living organism to be metabolized or eliminated by normal biological processes.
American Heritage Medicine
The time it takes for half of something to decompose, reduce in strength or effectiveness, etc.
Webster's New World
The time required for the radioactivity of material taken in by a living organism to be reduced to half its initial value by a combination of biological elimination processes and radioactive decay.
American Heritage Medicine
Webster's New World
Synonyms:

Other Word Forms of Half-life

Noun

Singular:
half-life
Plural:
half-lives

Origin of Half-life

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half-life