usage: more than is needed, desired, or required; "trying to lose excess weight"; "found some extra change lying on the dresser"; "yet another book on heraldry might be thought redundant"; "skills made redundant by technological advance"; "sleeping in the spare room"; "supernumerary ornamentation"; "it was supererogatory of her to gloat"; "delete superfluous (or unnecessary) words"; "extra ribs as well as other supernumerary internal parts"; "surplus cheese distributed to the needy"
3. spare, free, unoccupied (vs. occupied)
usage: not taken up by scheduled activities; "a free hour between classes"; "spare time on my hands"
4. spare, unnecessary (vs. necessary), unneeded
usage: kept in reserve especially for emergency use; "a reserve supply of food"; "a spare tire"; "spare parts"
usage: lacking embellishment or ornamentation; "a plain hair style"; "unembellished white walls"; "functional architecture featuring stark unornamented concrete"