injunction (n.)

early 15c., from Late Latin iniunctionem (nominative iniunctio) "a command," noun of action from past participle stem of Latin iniungere "impose, inflict, bring upon," literally "attach to," from in- "on" (from PIE root *en "in") + iungere "to join together," from nasalized form of PIE root *yeug- "to join."