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English definition of “alternate”

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alternate

verb uk   /ˈɒl.tə.neɪt/ us    /ˈɑːl.t̬ɚ-/
C1 [I usually + adv/prep] to happen or exist one after the other repeatedly: She alternated between cheerfulness and deep despair. [T usually + adv/prep] to make something happen or exist one after the other repeatedly: He alternated working in the office with long tours overseas.
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alternate

adjective [before noun] uk   /ɒlˈtɜː.nət/ us    /ɑːlˈtɝː-/

alternate

noun [C]
US a person or thing that can take the place of another: David was too sick to attend, so Janet served as his alternate.
alternately
adverb uk   /ɒlˈtɜː.nət.li/ us    /ɑːlˈtɝː-/
The film is alternately depressing and amusing.
alternating
adjective uk   /ˈɒl.tə.neɪ.tɪŋ/ us    /ˈɑːl.t̬ɚ.neɪ.t̬ɪŋ/
alternating moods of anger and sadness
(Definition of alternate from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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