I. pro noun , plural in construction
Etymology: Middle English bothe, probably from Old Norse bāthir; akin to Old High German beide both
Date: 12th century
the one as well as the other ,
II. conjunction
Date: 12th century
— used as a function word to indicate and stress the inclusion of each of two or more things specified by coordinated words, phrases, or clauses
III. adjective
Date: 13th century
being the two ; affecting or involving the one and the other