Definition of alignment

i. The planned direction of a tunnel or other roadway driven irrespective of coal seam or orebody structure; the planned direction of longwall panels or face lines.

Ref: Nelson

ii. Formation or position in line, or, more properly, in a common vertical plane.

Ref: Seelye, 2

iii. The laying out of the axis of a tunnel by instrumental work.

Ref: Stauffer

iv. See: coplaning

v. In railway or highway surveying, the ground plan, showing the alignment or direction of the route to be followed, as distinguished from a profile, which shows the vertical element.

Ref: Seelye, 2

vi. The act of laying out or regulating by line; adjusting to a line.