adjective satellite (s)

• supported by both sides(adj.all)

  Example:
  A two-way treaty.
  

  Synonym:
  bipartisan, bipartizan, two-party
  

  source: wordnet30
• involving two parts or elements(adj.all)

  Example:
  A two-way treaty.
  

  Synonym:
  bipartite, two-part
  

  source: wordnet30
• operating or permitting operation in either of two opposite directions(adj.all)

  Example:
  A two-way valve.
  Two-way traffic.
  Two-way streets.
  

  source: wordnet30