unilateralism (n.)youdaoicibaDictYouDict[unilateralism 词源字典]
1926, from unilateral + -ism. Earliest usages seem to be in the sense of "advocate of unilateral disarmament." Meaning "pursuit of a foreign policy without allies" is attested by 1964. [unilateralism etymology, unilateralism origin, 英语词源]