Source : Webster's Revised Unabridged Dictionary (1913)

Injunction \In*junc"tion\, n. [L. injunctio, fr. injungere,
   injunctum, to join into, to enjoin. See {Enjoin}.]
   1. The act of enjoining; the act of directing, commanding, or
      prohibiting.

   2. That which is enjoined; an order; a mandate; a decree; a
      command; a precept; a direction.

            For still they knew,and ought to have still
            remembered, The high injunction,not to taste that
            fruit.                                --Milton.

            Necessary as the injunctions of lawful authority.
                                                  --South.

   3. (Law) A writ or process, granted by a court of equity,
      and, insome cases, under statutes, by a court of
      law,whereby a party is required to do or to refrain from
      doing certain acts, according to the exigency of the writ.

   Note: It is more generally used as a preventive than as a
         restorative process, although by no means confined to
         the former. --Wharton. Daniell. Story.

Source : WordNet®

injunction
     n 1: a formal command or admonition
     2: (law) a judicial remedy issued in order to prohibit a party
        from doing or continuing to do a certain activity;
        "injunction were formerly obtained by writ but now by a
        judicial order" [syn: {enjoining}, {enjoinment}, {cease
        and desist order}]