based on or in accordance with what is generally done or believed:

〖通例名詞の前で〗伝統的な, 従来の, 旧来の, 慣例の〈方法･物･製品など〉(traditional)

e.g. a conventional morality had dictated behavior.

(of a person) concerned with what is generally held to be acceptable at the expense of individuality and sincerity.

｟時に非難して｠ 〈人･考え方･行動などが〉 «…において» 型にはまった, 月並みの, ありきたりの; 昔気質（かたぎ）の «in»

(of a work of art or literature) following traditional forms and genres:

〘美〙 様式化された

e.g. conventional love poetry.

(of weapons or power) nonnuclear:

〖通例名詞の前で〗核を使わない, 従来型の〈戦争･兵器など〉

e.g. agreement on reducing conventional forces in Europe.

Bridge (of a bid) intended to convey a particular meaning according to an agreed upon convention. Often contrasted with natural.

conventionalism |kənˈven(t)SH(ə)n(ə)lˌizəm| noun

conventionalist |kənˈven(t)SH(ə)n(ə)ləst| noun

conventionality |kənˌven(t)SHəˈnalədē| noun

conventionalize |kənˈven(t)SH(ə)n(ə)lˌīz| verb

late 15th century (in the sense ‘relating to a formal agreement or convention’): from French conventionnel or late Latin conventionalis, from Latin conventio(n-) ‘meeting, covenant’, from the verb convenire (see convene).