expression
another language; different languages
Refers to a language other than one's own, or to multiple distinct languages. Often used in contexts of translation, communication barriers, or linguistic diversity.
異言語間のコミュニケーションには通訳が必要だ。
Interpreters are necessary for communication between different languages.
彼は異言語の習得に熱心だ。
He is enthusiastic about learning another language.
多言語 means 'multilingual' and emphasizes the coexistence or use of multiple languages, whereas 異言語 focuses on the difference or otherness of languages.
Compound of 異 (i, 'different') and 言語 (gengo, 'language'). The exact historical derivation is uncertain, but the word follows a standard Sino-Japanese pattern for expressing 'different X'.