alternations
noun
Definitions
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
Example: alternation between night shifts and day shifts
The response of the congregation speaking alternately with the minister.
Ablaut.
A pattern by which more than one construct is possible, as with "Alice cooked Bob dinner" and "Alice cooked dinner for Bob".
Example: dative alternation; locative alternation