'oddity' definitions:

Definition of 'oddity'

From: WordNet
noun
Eccentricity that is not easily explained [syn: oddity, oddness]
noun
A strange attitude or habit [syn: oddity, queerness, quirk, quirkiness, crotchet]
noun
Something unusual -- perhaps worthy of collecting [syn: curio, curiosity, oddity, oddment, peculiarity, rarity]