n. pl. a·gen·cies
1. The condition of being in action; operation.
2. The means or mode of acting; instrumentality.
a. A business with agents that negotiate deals for clients: a talent agency; a real estate agency.
b. An advertising or public relations firm.
4. An administrative division of a government or international body.
[Medieval Latin agentia, from Latin agēns, agent-, present participle of agere, to do; see AGENT.]
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.