an adjustment to a line; arrangement in a straight line.
2.
the line or lines so formed.
3.
the proper adjustment of the components of an electronic circuit, machine, etc., for coordinated functioning: The front wheels of the car are out of alignment.
4.
a state of agreement or cooperation among persons, groups, nations, etc., with a common cause or viewpoint.
5.
a ground plan of a railroad or highway.
6.
Archaeology. a line or an arrangement of parallel or converging lines of upright stones or menhirs.