Both

Chamber's Twientieth Century Dictionary · 1908 · p. 15

bōth, adj. and pron. the two: the one and the other.— conj. as well: on the one side. [Ice. bath i , Ger. beide ; A.S. bâ ; cf. L. am-bo , Gr. am-phō , Sans. ubha , orig. ambha .]