› to order someone come to a particular place, or to officially tell someone to be present: The president summoned an emergency meeting of his advisers. I have been summoned to appear in court. › To summon is also to find, call, or gather together something for use: I couldn't summon any strength. He summoned up enough energy to prepare a revision of his novel. › To summon is also to remember or imagine something: He recollects the streets of Paris when he was a student and summons up the faces of fellow students.