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lifetime
noun
the
whole
period
during
which
a
person
or
other
living
thing
is
alive
•
During
her
lifetime
,
she
traveled
to
over
fifty
countries
.
During
her
lifetime
,
she
traveled
to
over
fifty
countries
.
•
The
scientist
became
world-famous
only
after
his
lifetime
.
The
scientist
became
world-famous
only
after
his
lifetime
.
Formed
from
life
+
time
in
the
14th
century
to
mean
the
duration
of
a
person
’
s
life
.
noun
the
length
of
time
that
something
continues
to
work
,
remain
useful
,
or
exist
•
The
LED
bulb
has
a
lifetime
of
about
25
,
000
hours
.
The
LED
bulb
has
a
lifetime
of
about
25
,
000
hours
.
•
Regular
oil
changes
will
extend
the
lifetime
of
your
car
engine
.
Regular
oil
changes
will
extend
the
lifetime
of
your
car
engine
.
By
extension
from
the
human
sense
,
first
recorded
19th
century
in
technical
writing
.
adjective
lasting
for
or
intended
to
last
for
the
whole
of
someone
’
s
life
or
the
whole
existence
of
something
•
She
purchased
a
lifetime
membership
at
the
local
museum
.
She
purchased
a
lifetime
membership
at
the
local
museum
.
•
Winning
the
gold
medal
was
a
lifetime
achievement
for
him
.
Winning
the
gold
medal
was
a
lifetime
achievement
for
him
.
Adjectival
use
developed
in
the
early
20th
century
from
the
noun
form
,
used
attributively
before
another
noun
.