[two-way] adj (1571) 1: being a cock or valve that will connect a pipe or channel with either of two others
2: moving or allowing movement in either direction "a ~ bridge" 3 a: involving or allowing an exchange between two individuals or groups "there must be good ~ communication --Jerrold Orne"; esp: designed for both sending and receiving messages "~ radio" b: involving mutual responsibility or reciprocal relationships "political alliance is a ~ thing --T. H. White d. 1986"
4: involving two participants "a ~ race"
5: usable in either of two manners "a ~ lamp"