BASE LINE
\bˈe͡ɪs lˈa͡ɪn], \bˈeɪs lˈaɪn], \b_ˈeɪ_s l_ˈaɪ_n]\
Definitions of BASE LINE
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By Willam Alexander Newman Dorland
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In Perspective, the line where the plane of the picture intersects the ground plane.
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In Surveying, an accurately measured line on which a network of triangles is constructed, whose angular points are conspicuous places, and whose distances from each other are calculated from the base and measured angles only.
By Henry Percy Smith