Definition of "alternate"
alternate
/ɒl.ˈtɜː(ɹ).nət/
adjective
not comparable
(US) Other; alternative.
noun
plural alternates
(US) A substitute; an alternative; one designated to take the place of another, if necessary, in performing some duty.
(mathematics) A proportion derived from another proportion by interchanging the means.
verb
third-person singular simple present alternates, present participle alternating, simple past and past participle alternated