Synonyms: bidirectional
Definition: reactive or functioning or allowing movement in two usually opposite directions
Similar words: biface, bifacial
Definition: having two faces or fronts
Usage: the Roman Janus is bifacial
Similar words: duplex
Definition: allowing communication in opposite directions simultaneously
Usage: duplex system; duplex telephony
Similar words: two-way
Definition: operating or permitting operation in either of two opposite directions
Usage: a two-way valve; two-way traffic; two-way streets