I. adjective
1.
Synonyms: alone 3, matchless, peerless, unequaled, unique, unmatched, unparagoned, unparalleled, unrivaled
2.
being one or more of which there exist no others
the only survivors of the wreck
Synonyms: alone, lone, singular, sole, solitary, solo, unexampled, unique, unrepeatable
Related Word: incomparable, inimitable, matchless, peerless, transcendent, unequaled, unparalleled, unrivaled; companionless, separate, unaccompanied, unattended, uncompanied, uncompanioned
Contrasted words: divers, many, multifarious, numerous, sundry, various
3.
Synonyms: single 2, lone, one, particular, separate, sole, solitary, unique
II. adverb
1.
to the exclusion of any alternative or competitor
he will confess only to you
Synonyms: alone, but, entirely, exclusively, solely
2.
Synonyms: just 3, but, merely, simply
III. conjunction
in spite of which
it looks delicious, only I'm not hungry
Synonyms: but, except, however, save, yet