To bring peace to a place or situation, often by calming or soothing those involved. The government sent troops to pacify the region after the unrest.
To appease or placate someone, often by meeting their demands or calming their anger. She tried to pacify the angry customer by offering a full refund.
To subdue or suppress (a group of people, rebellion, etc.) through the use of military or police force, bringing them under control. The army was deployed to pacify the rebels in the northern provinces.