Arrangement or position in a straight line or in parallel lines. The process of adjusting parts so that they are in proper relative position: A set of gears needs periodic alignment. The condition of having parts so adjusted: Binocular lenses that are out of alignment will yield a double image. A ground plan: Blueprints for the building included an alignment and a profile. The act of aligning or the condition of being aligned. An arrangement or alliance of groups: a new alignment of factions in the party. Sports An arrangement or positioning of players: a defensive alignment. Sports The grouping or positioning of teams, as in a conference or league.