noun
1. an odd or peculiar behavior, habit, interest, or the like.
Never going to bed was one of his eccentricities, and it wasn’t surprising to find him slumped over his desk or asleep on the stairs in the mornings.
2. the quality or condition of being eccentric.
Some people found her grandfather uncomfortably odd, but she loved his eccentricity.
3. the degree to which someone or something is eccentric.