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