1. An opening or a structure framing an opening, such as an arch, that may be closed by a gate.
2. Something that serves as an entrance or a means of access: a gateway to success; the gateway to the West.
3. Software or hardware that enables communication between computer networks that use different communications protocols. Also called router2.
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.