alternation

[awl-ter-ney-shuhn, al-]
noun
1.
the act or process of alternating or the state of being alternated.
2.
alternate succession; repeated rotation: the alternation of the seasons.
3.
Electricity. a single fluctuation in the absolute value of an alternating current or voltage from zero to a maximum and back to zero, being equal to one half cycle.
4.
Linguistics. variation in the form of a linguistic unit as it occurs in different environments or under different conditions, as between the -ed and -en forms of the past participle in danced and spoken or between the (t) and (d) pronunciations of the past tense suffix -ed in hopped and rubbed.

Origin:
1605–15; < Late Latin alternātiōn- (stem of alternātiō). See alternate, -ion

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Collins
World English Dictionary
alternation (ˌɔːltəˈneɪʃən)
 
n
1.  successive change from one condition or action to another and back again repeatedly
2.  logic another name for disjunction

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

alternation
1610s, from Fr.alternation, from L. alternationem (nom. alternatio), noun of action from alternatus, pp. of alternare (see alternate).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

alternation al·ter·na·tion (ôl'tər-nā'shən, āl'-)
n.
Successive change from one thing or state to another and back again.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Its arrival in the presidency would represent a healthy alternation of power.
The conduct of the government has been an alternation of periods of slumber and periods of rush.
He manages this by an adroit alternation between the macrocosmic and the microcosmic.
An alternation between the enchantment of the panorama and of the starry night sky.
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