To call, cite or notify by authority to appear at a place specified, or to attend in person to some public duty, or both; as, to summon a jury; to summon witnesses. The parliament is summoned by the king’s writ or letter. Nor trumpets summon him to war.

To give notice to a person to appear in court and defend.

To call or command. Love, duty, safety summon us away.

To call up; to excite into action or exertion; with up. Summon up all your strength or courage. Stiffen the sinews, summon up the blood.