alternations is a form of:

Alternation



noun
1.
(act of alternating, state of being alternated, repeated. rotation, one half of an alternating cycle) បំលាស់ប្ដូរ
2.
(បច្ចេកទេស) ការផ្លាស់ប្តូរ
ENGLISH MEANING
noun
1.
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.
2.
The response of the congregation speaking alternately with the minister.
1.
Permutation