spare
adjective
\ ˈsper
\
\
sparer;
sparest
Definition of spare
(Entry 1 of 3)
1
: not being used
especially
: held for emergency use
a spare tire
2
: being over and above what is needed : superfluous
spare time
3
: not liberal or profuse : sparing
a spare prose style
4
: healthily lean
5
: not abundant or plentiful