1.An adjustment in a straight line.
2. The theoretical, definitive lines that establish the position of construction (such as a building) or the shape of an individual element (such as a curved or straight beam).
3.In highway and other surveys, the ground plan depicting direction of the route as distinguished from a profile, which shows the vertical element.
4.In prehistoric building, formal alleys of standing stones, as at Carnac in France.
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