Idiomatic (adjective)

1. Peculiar to a particular language or dialect; characteristic of a particular language or dialect.
2. Expressed in an idiomatic way; using idiomatic language.
3. Having a natural and spontaneous quality; appropriate to the circumstances.

Origin:

Late 18th century: from french idiomatique, or via late latin from greek idiōmatikos, from idiōma "peculiarity, dialect", from idios "own, private".

Examples:

1. The idiomatic phrase "kick the bucket" means "to die".
2. He spoke in an idiomatic way, using many colloquial expressions.
3. It is important to understand idiomatic expressions in order to fully understand a language.
4. The idiomatic way of saying "I"m feeling great" in Spanish is "Me siento genial".
5. It was an idiomatic performance, full of energy and feeling.