[syn: bipartite, two-part, two-way]
3.  operating or permitting operation in either of two opposite directions; 
- Example: "a two-way valve"
- Example: "two-way traffic"
- Example: "two-way streets"
The Collaborative International Dictionary of English v.0.48:
Two-way \Two"-way`\, a. (Pipe Fitting)
   Serving to connect at will one pipe or channel with either of
   two others; as, a two-way cock.
   [Webster 1913 Suppl.]
WordNet (r) 3.0 (2006):
two-way
    adj 1: supported by both sides; "a two-way treaty" [syn:
           bipartisan, bipartizan, two-party, two-way]
    2: involving two parts or elements; "a bipartite document"; "a
       two-way treaty" [syn: bipartite, two-part, two-way]
    3: operating or permitting operation in either of two opposite
       directions; "a two-way valve"; "two-way traffic"; "two-way
       streets"