sole

1 belonging only to the one person, unit, or group named <the landowner has sole rights to the property, so he can do whatever he wants to with it> Synonyms exclusive, single, unshared Related Words proprietary; personal, private Near Antonyms common, communal, conjoint, cooperative, joint, multiple, mutual, pooled, public, shared, united Antonyms nonexclusive

2 being the one or ones of a class with no other members <the eldest son became the family's sole support> Synonyms alone, lone, one, one-off, singular, only, solitary, special, sui generis, uniqueRelated Words single, solo, unaccompanied, unattended; incomparable, inimitable, matchless, peerless, unequaled (or unequalled), unmatched, unparalleled, unrivaled (or unrivalled), unsurpassable, unsurpassed; distinct, distinctive, individual, separate; nonceNear Antonyms divers, manifold, multifarious, myriad; assorted, heterogenous, miscellaneous, mixed, motley, patchwork, promiscuous, varied; popular, prevailing, prevalent, rampant; perennial, recurrent, repeated