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half-life
/ˈhæfˌlaɪf/
/Brit ˈhɑːfˌlaɪf/
US
UK
noun
plural -lives
[count] technical :the time it takes for a radioactive substance to lose half its radioactivity
a
half-life
of
200,000
years
-
often
used
figuratively
to
describe
how
long
something
remains
useful
or
popular
Slang
usually
has
a
short
half-life. [=
slang
usually
is
popular
for
only
a
short
time
]
US