1. (n.) The act of adjusting to a line; arrangement in a line or lines; the state of being so adjusted; a formation in a straight line; also, the line of adjustment; esp., an imaginary line to regulate the formation of troops or of a squadron.

2. (n.) The ground-plan of a railway or other road, in distinction from the grades or profile.

accommodation adaptation adjustment affiliation alliance amalgamation analogy association bearings cahoots coadunation coalescence coalition coextension colleagueship collegialism collegiality collineation combination comradeship concurrence confederacy confederation confraternity consolidation copartnership copartnery disorientation equidistance federation fellowship fraternalism fraternity fraternization freemasonry fusion hookup inclusion incorporation integration league merger nondivergence orientation parallelism partnership sodality sorority tie-in tie-up unification union