tr.v. en·joined, en·join·ing, en·joins
a. To direct (a person) to do something; order or urge: The doctor enjoined the patient to walk daily.
b. To require or impose (an action or behavior, for example) with authority and emphasis; prescribe.
2. To prohibit or forbid: The judge enjoined the merger of the firms. The court enjoined the company from merging with its competitor.
[Middle English enjoinen, from Old French enjoindre, from Latin iniungere : in-, causative pref.; see EN-1 + iungere, to join; see yeug- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.