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half-life
1 ENTRIES FOUND:
plural half-lives
plural half-lives
Learner's definition of HALF-LIFE
[count] technical
: the time it takes for a radioactive substance to lose half its radioactivity（放射物质的）半衰期 — often used figuratively to describe how long something remains useful or popular常用作比喻，指某物的繁荣期或流行期
- a half-life of 200,000 years*20万年的半衰期
- Slang usually has a short half-life. [=slang usually is popular for only a short time]俚语的流行周期通常很短。
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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