Definitions
1.nounVerbal exchange, conversation.
2.nounExpression in words, either speech or writing.
3.nounA formal lengthy exposition of some subject, either spoken or written."The preacher gave us a long discourse on duty."
4.nounAny rational expression, reason.
5.nounAn institutionalized way of thinking, a social boundary defining what can be said about a specific topic (after Michel Foucault).
6.nounDealing; transaction.