noun
Political or economic principle of conducting relations between two countries, as opposed to multilateralism.
バイラテラリズムは、二国間の貿易協定の基礎となる考え方だ。
Bilateralism is the concept underlying trade agreements between two countries.
Multilateralism involves multiple countries, while バイラテラリズム is strictly between two.
Unilateralism is action taken by a single country, contrasting with the two-party focus of バイラテラリズム.
Borrowed from English 'bilateralism', itself from 'bilateral' + '-ism'.