Its usual sense is "to impose something," as a command, a charge or a direction. In this last sense it is used in Job 36:23, i.e. "Who hath directed?" In Es 9:31 it means "to command"; in Phm 1:8, "to order" or "direct."
The International Standard Bible Encyclopedia
Enjoin
The International Standard Bible Encyclopedia, James Orr (1915). Public domain, from the CrossWire SWORD module.