1. Supported by both sides
   "a two-way treaty"
   - bipartisan, bipartizan, two-party 
2. Involving two parts or elements
   "a two-way treaty"
   - bipartite, two-part 
3. Operating or permitting operation in either of two opposite directions
   "a two-way valve"; "two-way traffic"; "two-way streets"

See also: bidirectional, many-sided, multilateral, nonpartisan, nonpartizan

Encyclopedia: Two-way

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