alternate

adj

1. (not-comparable)Happening by turns; one following the other in succession of time or place; first one and then the other (repeatedly).

   “And bid alternate passions fall and rise”

   “One of the two boxes displaced by the new Pelaw installation will be Springwell, between Boldon Colliery and Pelaw, which has recently had the distinction of being manned by a husband and wife on alternate shifts.”

   “The service is half-hourly as far as Harrogate and Knaresborough, with alternate trains going on to York.”

2. (not-comparable)Happening by turns; one following the other in succession of time or place; first one and then the other (repeatedly).

   “Goldschmidt (Austria; creation July 27, 1862): [...] party, argent and gules, an eagle of alternate colors, [...]”

3. (not-comparable)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.”

4. (US, not-comparable)Other; alternative.

   “Hyperlinked text is displayed in alternate color in a Web browser.”

   “He lives in an alternate universe and an alternate reality.”

5. (not-comparable)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).”

noun

1. That which alternates with something else; vicissitude.

   “Grateful alternates of substantial peace.”

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

   “Corridors beyond this point have collapsed. I'm looking for an alternate. Careful.”

3. A proportion derived from another proportion by interchanging the means.
4. (US)A replacement of equal or greater value or function.

verb

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

   “The most high God, in all things appertaining unto this life, for sundry wise ends alternates the disposition of good and evil.”

2. (intransitive)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.”

3. (intransitive)To vary by turns.

   “The land alternates between rocky hills and sandy plains.”

4. (transitive)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.

   “This case suggests that the alternation of a polyhedron should be bounded by actual vertex figures and alternated faces. The case of the cube is in agreement with this notion, since the alternated square is nothing.”