To call, cite, or notify by authority to appear at a place specified, to attend in person to some public duty, or to assume a certain rank or dignity; especially, to command to appear in court: as, to summon a jury; to summon witnesses.To call; send for; ask the presence or attendance of, literally or figuratively.To call on to do some specified act; warn; especially, to call upon to surrender: as, to summon a fort.To arouse; excite into action or exertion; raise: with up.Synonyms and Invite, Convoke, etc. (see call), convene, assemble.n. An invitation, request, or order.