The noun convention has 5 senses (first 2 from tagged texts)
1. (4) convention -- (a large formal assembly; "political convention")
2. (4) convention, normal, pattern, rule, formula -- (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")
3. convention -- ((diplomacy) an international agreement)
4. conventionality, convention, conventionalism -- (orthodoxy as a consequence of being conventional)
5. convention, convening -- (the act of convening)