In reciprocal succession; succeeding by turns; in alternate order. / (mathematics) By alternation; when, in a proportion, the antecedent term is compared with antecedent, and consequent.

Relating to a choice between two or more possibilities. / (linguistics) Presenting two or more alternatives. / Other; different from something else.

A situation which allows a mutually exclusive choice between two or more possibilities; a choice between two or more possibilities. / One of several mutually exclusive things which can be chosen.

The reciprocal succession of (normally two) things in time or place; the act of following and being followed by turns; alternate succession, performance, or occurrence

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

That which alternates with something else; vicissitude. / (US) A substitute; an alternative; one designated to take the place of another, if necessary, in performing some duty.

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

in an alternative way / (conjunctive) Used to link a pair of possibilities

present participle of alternate

That alternates. / (mathematics, of a knot) Having a planar diagram whose crossings alternate between "over" and "under" as one travels along the knot.