## ALTERNATION

### Alternation

In geometry, an alternation is an operation on a polyhedron or tiling that removes alternate vertices. Only even-sided polyhedra can be alternated, for example the zonohedra. Every 2n-sided face becomes n-sided. Square faces disappear into new edges.

The above text is a snippet from Wikipedia: Alternation (geometry)

### alternation

#### Noun

1. The reciprocal succession of (normally two) things in time or place; the act of following and being followed by turns; alternate succession, performance, or occurrence; as, the alternation of day and night, cold and heat, summer and winter, hope and fear.
2. The response of the congregation speaking alternately with the minister.
3. Ablaut.
4. The "inclusive or" truth function.
5. A sequence that alternates between positive and negative values. (Sometimes wrongly used to mean a permutation.)
6. A construct in a regular expression that can match any of several specified subexpressions.

The above text is a snippet from Wiktionary: alternation