alternate
adjective
°Being or succeeding by turns; one following the other in succession of time or place; by turns first one and then the other; hence, reciprocal.
"And bid alternate passions fall and rise. -Alexander Pope"
°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."
noun
°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.
verb
°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.