a. Affording passage in two directions: a two-way street.
b. Moving in two directions: two-way traffic.
a. Permitting communication in two directions: a two-way radio.
b. Permitting flow in two directions: a two-way valve.
a. Expressive of or involving mutual action, relationship, or responsibility.
b. Involving two participants: a two-way treaty.
4. Sports Playing both offense and defense: a two-way player.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.