A distinctive behavioral trait, habit, or characteristic peculiar to an individual; an unusual feature or quirk that sets someone or something apart.
From Greek 'idios' (one's own, private) + 'syn' (together) + 'krasis' (mixture). Originally a medical term meaning an individual's unique physical constitution, it expanded to include behavioral and mental peculiarities.
Idiosyncrasy = 'idiot's sync' — but not really! It's your personal 'sync,' the unique way you're wired. Everyone has idiosyncrasies; they're the quirks that make you distinctly you, not like everyone else.
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