Marching \March"ing\, a. & n., fr. {March}, v. {Marching money} (Mil.), the additional pay of officer or soldier when his regiment is marching. {In marching order} (Mil.), equipped for a march. {Marching regiment}. (Mil.) (a) A regiment in active service. (b) In England, a regiment liable to be ordered into other quarters, at home or abroad; a regiment of the line.