alter nation

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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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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