I. pronoun, plural in construction Etymology: Middle English ~e, probably from Old Norse bāthir; akin to Old High German beide ~ 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