half life
half·life
noun
1.
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)
2.
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)
Origin
From half- + life.
Related words
Word family
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.