ALTERNATE (2)

alternate (2). Alternate, v.t. to change or perform by turns

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Al‐ter″nate (?; 277), n. 1. 1. That which alternates with something else; vicissitude.
Grateful alternates of substantial. Prior. 2. 2. A substitute; one designated to take the place of another, if necessary, in performing some duty.
3. 3. (Math.) A proportion derived from another proportion by interchanging the means.