That which alternates with something else; vicissitude.

A substitute; an alternative; one designated to take the place of another, if necessary, in performing some duty.

A proportion derived from another proportion by interchanging the means.

A replacement of equal or greater value or function.

Figures or tinctures that succeed each other by turns.

To perform by turns, or in succession; to cause to succeed by turns; to interchange regularly.

To happen, succeed, or act by turns; to follow reciprocally in place or time; followed by with.

"The flood and ebb tides alternate with each other."

To vary by turns.

"The land alternates between rocky hills and sandy plains."

To perform an alternation (removal of alternate vertices) on (a polytope or tessellation); to remove vertices (from a face or edge) as part of an alternation.

Happening by turns; one following the other in succession of time or place; first one and then the other (repeatedly)

"alternate picking is a guitar playing technique"

Designating the members in a series, which regularly intervene between the members of another series, as the odd or even numbers of the numerals; every other; every second.

"the alternate members 1, 3, 5, 7, etc."

Other; alternative.

"He lives in an alternate universe and an alternate reality."

(of leaves) Distributed singly at different heights of the stem, and at equal intervals as respects angular divergence.

"Many trees have alternate leaf arrangement (e.g. birch, oak and mulberry)."