enjoin

UK: /ɪnˈdʒɔɪn/ US: (en join′)

WordReference Random House Unabridged Dictionary of American English © 2025

en•join  (en join′), v.t. 

1. to prescribe (a course of action) with authority or emphasis:
   The doctor enjoined a strict diet.
2. to direct or order to do something:
   He was enjoined to live more frugally.
3. Law to prohibit or restrain by an injunction.

• Latin injungere to fasten to, bring upon. See in-², join
• Old French enjoindre
• Middle English enjoi(g)nen 1175–1225

en•join′er, n. 
en•join′ment, n. 
Synonyms

• 2. charge, bid, command, require.
• 3. proscribe, interdict, ban.

Collins Concise English Dictionary © HarperCollins Publishers::

enjoin / ɪnˈdʒɔɪn/ verb (transitive)

1. to order (someone) to do (something); urge strongly; command
2. to impose or prescribe (a condition, mode of behaviour, etc)
3. to require (a person) to do or refrain from doing (some act), esp by issuing an injunction

Etymology: 13th Century: from Old French enjoindre, from Latin injungere to fasten to, from in-² + jungere to join

enˈjoiner noun

enˈjoinment noun