The Walloon language.

The Coptic language of Egypt.

(historical) languages spoken by the Allied Powers and borrowed words in Japanese that originated from such languages

(linguistics) "role language": unique language usage serving as a marker of social identity in fictional speech

a target, a mark, a bullseye / an objective, an object (of doing something)

as far as ... is concerned; in terms of ...

school grammar / (specifically) Japanese school grammar, based on Shinkichi Hashimoto's work and now universally employed in Japanese schools and dictionaries.

(grammar) solecism

codependency

addiction