singular (adj.)

mid-14c., "alone, apart; being a unit; special, unsurpassed," from Old French singuler "personal particular; distinctive; singular in number" (12c., Modern French singulier) or directly from Latin singularis "single, solitary, one by one, one at a time; peculiar, remarkable," from singulus "one, one to each, individual, separate" (see single (adj.)). Meaning "remarkably good, unusual, rare, separated from others (by excellence), uncommon" is from c. 1400 in English; this also was a common meaning of Latin singularis.

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Definitions of singular from WordNet
singular (adj.)
unusual or striking;
such poise is singular in one so young
Synonyms: remarkable
singular (adj.)
beyond or deviating from the usual or expected;
singular behavior
Synonyms: curious / funny / odd / peculiar / queer / rum / rummy
singular (adj.)
being a single and separate person or thing; "every fact in the world might be singular...unlike any other fact and sole of its kind"-William James;
can the singular person be understood apart from his culture?
singular (adj.)
composed of one member, set, or kind;
singular (adj.)
grammatical number category referring to a single item or unit;
singular (adj.)
the single one of its kind;
a singular example
Synonyms: unique
singular (n.)
the form of a word that is used to denote a singleton;
Synonyms: singular form