say it: AWL-tur-nay-shuhn
alternation is a noun meaning "successive change from one thing or state to another and back again". It is pronounced /ˈɔltɚˌneɪʃən/ — AWL-tur-nay-shuhn. 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.