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- file 834
1
: the time required for half of something to undergo a process: such as
a
: the time required for half of the atoms of a radioactive substance to become disintegrated
b
: the time required for half the amount of a substance (such as a drug, radioactive tracer, or pesticide) in or introduced into a living system or ecosystem to be eliminated or disintegrated by natural processes
Word History
First Known Use
1907, in the meaning defined at sense 1
Time Traveler
The first known use of half-life was in 1907 👨🏻🏫 Mr. Ng 韋氏詞典 📚 – mw.mister5️⃣.net
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