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Noun: alternation  ,ol-tur'ney-shun [N. Amer], ,ól-tu(r)'ney-shun or ,ol-tu(r)'ney-shun [Brit]
  1. Successive change from one thing or state to another and back again
    "a trill is a rapid alternation between the two notes"

Derived forms: alternations

Type of: sequence, succession

Encyclopedia: Alternation