Meaning of ONE AND ONLY(A)

WordNet Dictionary
	Definition:		[adj]  eminent beyond or above comparison; "matchless beauty"; "the team's nonpareil center fielder"; "she's one girl in a million"; "the one and only Muhammad Ali"; "a peerless scholar"; "infamy unmatched in the Western world"; "wrote with unmatchable clarity"; "unrivaled mastery of her art"
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	Synonyms:		incomparable, matchless, nonpareil, one(a), peerless, uncomparable, unmatchable, unmatched, unrivaled, unrivalled