ALTERNATIONS
Noun
alternations
plural of alternation
Source: Wiktionary
ALTERNATION
Al`ter*na"tion, n. Etym: [L. alternatio: cf. F. alternation.]
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. (Math.)
Definition: Permutation.
3. The response of the congregation speaking alternately with the
minister. Mason. Alternation of generation. See under Generation.
Source: Webster’s Unabridged Dictionary 1913 Edition