half-life

Fetched 2026-10-26 (cache).

Synonyms: half life, half-line, halflife, half-pike, half-tide, half-time, half-size, half-pipe, half line, self-life, half-lifes

Antonyms: half life, half-line, halflife, half-pike, half-tide, half-time, half-size, half-pipe, half line, self-life, half-lifes

Related words from Datamuse; suggestions, not definitions.

Noun

1. {{lb|en|nuclear physics}} The time required for half the [[nucleus|nuclei]] in a [[sample]] of an [[isotope]] to undergo [[radioactive decay]].
2. {{lb|en|physical chemistry}} In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value.
3. {{lb|en|medicine|pharmacology}} The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacological, physiologic, or radiological activity.
4. The amount of time it takes for an [[idea]] or a [[fashion]] to lose half of its [[influential]] [[power]].

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.