An oddity is anything strange or unusual. Wearing ear muffs during a heat wave would be considered an oddity, because most people wouldn't do that.

Anything odd is weird, strange, unusual, or bizarre. Oddities are things like that. Calling good friends "sir" would be an oddity, since that word is usually used in formal situations. Oddities can also be objects, especially unusual objects or souvenirs someone might collect.

Definitions of oddity

n eccentricity that is not easily explained

Type of:
strange and unconventional behavior

n a strange attitude or habit

crotchet, queerness, quirk, quirkiness
Type of:
strangeness, unfamiliarity
unusualness as a consequence of not being well known

n something unusual — perhaps worthy of collecting

curio, curiosity, oddment, peculiarity, rarity
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bric-a-brac, knickknack, knickknackery, nicknack, whatnot
miscellaneous curios
collectable, collectible
things considered to be worth collecting (not necessarily valuable or antique)
collector's item, piece de resistance, showpiece
the outstanding item (the prize piece or main exhibit) in a collection
chachka, tchotchke, tsatske, tshatshke
(Yiddish) an inexpensive showy trinket
(plural) rare collector's items
Type of:
object, physical object
a tangible and visible entity; an entity that can cast a shadow

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