Rectification

Noun

1. The action or process of rectifying.

   "the rectification of an error; the rectification of spirits"

2. The determination of a straight line whose length is equal to a portion of a curve.
3. 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.
4. The adjustment of a globe preparatory to the solution of a proposed problem.
5. Purification of a substance through repeated or continuous distillation.