noun
both languages; the two languages
Refers to two specific languages previously mentioned or understood from context. Often used in discussions of bilingualism, translation, or comparison.
彼は両国語を流暢に話す。
He speaks both languages fluently.
この辞書は両国語の対訳が載っている。
This dictionary contains translations for both languages.
Compound of 両 (both) + 国 (country) + 語 (language). The exact historical derivation is uncertain, but the meaning is transparent from its components.