from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Affording passage in two directions: a two-way street.
  • adj. Moving in two directions: two-way traffic.
  • adj. Permitting communication in two directions: a two-way radio.
  • adj. Permitting flow in two directions: a two-way valve.
  • adj. Expressive of or involving mutual action, relationship, or responsibility.
  • adj. Involving two participants: a two-way treaty.
  • adj. Sports Playing both offense and defense well: a two-way player.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. allowing traffic in two directions
  • adj. moving in both directions
  • adj. permitting communication in two directions
  • adj. involving the mutual action or participation of two parties
  • adj. Playing both offense and defense in the same game

from the GNU version of the Collaborative International Dictionary of English

  • adj. Serving to connect at will one pipe or channel with either of two others.

from The Century Dictionary and Cyclopedia

  • Having the capacity to act in two ways: said of a fitting or fixture which has one inlet and one outlet.
  • Noting a fitting resembling a T, with one inlet and two outlets, but no control over the flow through them.
  • In mech., having two ways or passages.
  • In mathematics, having a double mode of variation. Thus, a surface is a two-way spread.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. involving two parts or elements
  • adj. supported by both sides
  • adj. operating or permitting operation in either of two opposite directions


From two- +‎ way. Compare Old English twiweġ ("intersection, junction of two roads"). (Wiktionary)



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