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The action or process of rectifying.
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(geometry) The determination of a straight line whose length is equal to a portion of a curve.
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(geometry) The truncation of a polyhedron by replacing each vertex with a face that passes though the midpoint of each edge connected to the vertex; an analogous procedure on a polytope of dimension higher than 3.
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(astronomy) The adjustment of a globe preparatory to the solution of a proposed problem.
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(chemistry, chemical engineering) Purification of a substance through repeated or continuous distillation.
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(politics, historical) Any of a number of Chinese and Filipino communist purges. See rectification movement.
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(astrology) A procedure that attempts to determine a person's time of birth based on events in their life.