What does alignment mean?
The definition of alignment
A*lign”ment, n.
Etym: [F. alignement.]

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