n.1. Arrangement or position in a straight line or in parallel lines.
2. a. The process of adjusting parts so that they are in proper relative position: A set of gears needs periodic alignment.
b. The condition of having parts so adjusted: Binocular lenses that are out of alignment will yield a double image.
3. A ground plan: Blueprints for the building included an alignment and a profile.
4. The act of aligning or the condition of being aligned.
5. An arrangement or alliance of groups: a new alignment of factions in the party.
6. Sports a. An arrangement or positioning of players: a defensive alignment.
b. The grouping or positioning of teams, as in a conference or league.