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