Etymology
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peculiarity (n.)

c. 1600, "exclusive possession, private ownership" (a sense now obsolete); 1640s, "a special characteristic of a person or thing," from peculiar + -ity, or else from Latin peculiaritas. Meaning "quality of being peculiar, individuality" is from 1640s; that of "an oddity" is attested by 1777. Related: Peculiarities.

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Definitions of peculiarity

peculiarity (n.)
an odd or unusual characteristic;
Synonyms: distinctive feature / distinguishing characteristic
peculiarity (n.)
a distinguishing trait;
Synonyms: specialness / specialty / speciality / distinctiveness
peculiarity (n.)
something unusual -- perhaps worthy of collecting;
Synonyms: curio / curiosity / oddity / oddment / rarity
From wordnet.princeton.edu