Permutation.

a pattern in which a number of words share the same relationship between a pair of senses

In linguistics, alternation is the phenomenon where one phoneme is pronounced differently in different words. It occurs for grammatical, phonological and syntactical reasons. Each pronunciation is called an alternate.

Alternation is a solitaire card game which is played using two decks of playing cards. Its tableau (or playing area) is similar to that of another solitaire game, Stonewall.

a control structure that generates the results of its first operand followed by the results of its second operand. See also disjunction.

The reciprocal succession of 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.

successive change from one thing or state to another and back again

The response of the congregation speaking alternately with the minister.

If wave two is a sharp correction, wave four will usually be a sideways correction, and vice versa.

a category of domain relation s that are used in situations of choice, parallel to the logical connector "or.".

Alternation is the term used when a regular expression pattern chooses between two or more choices. For example, m/one|two|three/ will match if the string in contains any one of the three character sequences: one, two, or three. See also Regular Expression.

One-half of a cycle, consisting of the complete rise and fall of an alternating voltage or current in one direction.

Either half of a cycle of alternating current. It is the time period during which the current increases from zero to its maximum value (in either direction) and decreases to zero.

being regularly exchangeable