adjective
idiomatic
id-ee-uh-MAT-ik/ˌɪdiəˈmætɪk/
Natural and typical of how a language is used.
The friend's idiomatic reply of No problem sounds natural in casual conversation.

Etymology
Greek idiōmatikos meant “peculiar” or “characteristic.” In language, this became the idea of expression characteristic of a particular language—what sounds natural in its own usage.
In context
provide a very fluent natural idiomatic programming experience that is tailored to that language so it will be attractive it will feel natural to developers in that language
More examples
- The sentence is grammatically correct but not idiomatic.
- In idiomatic English, we say "make a decision," not "do a decision."
- Listening to everyday conversations helps me write more idiomatic Spanish.
Forms
idiomatic
idiomatically adverb — In a way natural to a language.