something regarded as a normative example; "the convention of not naming the main character"; "violence is the rule not the exception"; "his formula for impressing visitors"
a formal agreement establishing an association or alliance between nations or other groups to achieve a particular aim
an organization of people (or countries) involved in a pact or treaty
a connection based on kinship or marriage or common interest; "the shifting alliances within a large family"; "their friendship constitutes a powerful bond between them"
the speech act of answering an attack on your assertions; "his refutation of the charges was short and persuasive"; "in defense he said the other man started it"