Cases of word usage

1) a way of thinking or behaving that is peculiar to a person (idiosyncrasy)

2) a peculiar kind of behaviour, way of speaking etc, especially one that is a habit (mannerism)

3) (of a number) not exactly divisible to two: '1, 3, 5 and 7 are odd numbers'; one of a pair when the other is missing; not regular, habitual or fixed; strange; peculiar (odd)