alternation

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

the alternation of day and night

alternation of summer and winter

The response of the congregation speaking alternately with the minister.

There are Anthems to be found amongst them , where every syllable has its just length ; each part of a sentence its proper pause : where the words are not confused by perplexing alternations, or rendered tedious by unnecessary repetitions

Ablaut.

A pattern by which more than one construct is possible, as with "Alice cooked Bob dinner" and "Alice cooked dinner for Bob".

dative alternation; locative alternation

The "inclusive or" truth function.