session

(noun) a meeting for execution of a group's functions. Example: "It was the opening session of the legislature."

(noun) the time during which a school holds classes. Synonyms: school term, academic term, academic session. Example: "They had to shorten the school term."

(noun) a meeting devoted to a particular activity. Examples: "A filming session." "A gossip session."

(noun) a meeting of spiritualists. Synonyms: seance, sitting. Example: "The seance was held in the medium's parlor."