Idiosyncrasy comes from the Greek: idios “one’s own” and sun-krasis “temperament” or “mixture.” Idiosyncrasy is a peculiar habit or characteristic of an individual or group. It can also refer to mental and physical characteristics. Below you will find examples of the usage.
This compendium of epithets, pejoratives, blasphemies and obscenities manages to be informal in its style without succumbing to idiosyncrasy or leering. (NY Times)
As far as I know, the Soviet Union had a pretty good research sector. But it did a miserable job of translating this research into consumer products, or indeed any products, except possibly weapons. You could chalk this up to some idiosyncrasy of the Soviet Union. (The Economist)