alignment: 1. the act of aligning or state of being aligned; (especially) the proper positioning or state of adjustment of parts (as of a mechanical or electronic device) in relation to each other; a set of gears needs alignment. 2a. arrangement or position in a straight line or in parallel lines. b. the line thus formed. 3. the ground plan (as of a railroad or highway) in distinction from the profile. 4. an arrangement of groups or forces in relation to one another; new alignments within the political party.