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say it: AWL-tur-nay-shuhn
alternation is a noun meaning "successive change from one thing or state to another and back again". It carries one recorded sense.
successive change from one thing or state to another and back again
“a trill is a rapid alternation between the two notes”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for alternation come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.