noun
common language; lingua franca
Refers to a language shared by speakers of different native languages, used for communication between groups. Can be a natural language, a constructed language, or a specialized jargon.
英語は国際的な共通言語として使われている。
English is used as an international common language.
このプロジェクトでは、日本語を共通言語にしよう。
Let's use Japanese as the common language for this project.
Compound of 共通 (common, shared) and 言語 (language).