rectification

Short definition from Wiktionary

Noun

1. 1
   The action or process of rectifying.
2. 2
   The determination of a straight line whose length is equal to a portion of a curve.
3. 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. 4
   The adjustment of a globe preparatory to the solution of a proposed problem.
5. 5
   Purification of a substance through repeated or continuous distillation.
6. 6
   Any of a number of Chinese and Filipino communist purges. See rectification movement.
7. 7
   A procedure that attempts to determine a person's time of birth based on events in their life.