唯一
Unique \U*nique"\, a. [F. unique; cf. It. unico; from L. unicus, from unus one. See {One}.] Being without a like or equal; unmatched; unequaled; unparalleled; single in kind or excellence; sole. -- {U*nique"ly}, adv. -- {U*nique"ness}, n.
uniqueness n : the quality of being one of a kind; "that singularity distinguished him from all his companions" [syn: {singularity}]