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English definition of “alternate”

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alternate

adjective [not gradable]  /ˈɔl·tər·nət/ us  
every second, or every other: I visit my father on alternate weekends. Note: Used only about sets of two.

alternate

noun [C]  /ˈɔl·tər·nət/ us  
one that can take the place of another: David was too sick to attend, so Janet served as his alternate.
(Definition of alternate adjective, noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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