A meeting of a legislative or judicial body for the purpose of transacting business. A series of such meetings. The term or duration of time that is taken by such a series of meetings. The part of a year or of a day during which a school holds classes. An assembly of people for a common purpose or because of a common interest: a gossip session. Law A court of criminal jurisdiction in the United States: the court of sessions. A period of time devoted to a specific activity, as to recording music in a studio.