DEFINITION - "Oddity"

Noun.

1. oddity - eccentricity that is not easily explained
oddness.
eccentricity - strange and unconventional behavior

2. oddity - a strange attitude or habit
queerness, quirk, quirkiness, crotchet
strangeness, unfamiliarity - unusualness as a consequence of not being well known.

3. oddity - something unusual -- perhaps worthy of collecting.
curio, curiosity, oddment, peculiarity, rarity
object, physical object - a tangible and visible entity; an entity that can cast a shadow; "it was full of rackets, balls and other objects"
bric-a-brac, knickknackery, nicknack, whatnot, knickknack - 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.