[ad. L. complānātion-em, n. of action f. complānāre: see COMPLANATE v.] Making plane or level, flattening out; spec. in Math., the reduction of a curved surface to an equivalent plane area.

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1695.  Phil. Trans., XIX. 74. The Rectification and Complanation of Curve Lines and Surfaces.

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1761.  Nicholls, ibid., LII. 272. Preventing the right auricle from being stretched by the depressions (or complanations) of the diaphragm.

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1816.  Edin. Rev., XVI. 96. The cubature and complanation of solids.

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1850.  Dana, Geol., vii. 370. It was once a crater of elevation … it is now a crater of complanation.

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