Source : Webster's Revised Unabridged Dictionary (1913)

Impose \Im*pose"\, v. t. [imp. & p. p. {Imposed}; p. pr. & vb.
   n. {Imposing}.] [F. imposer; pref. im- in + poser to place.
   See {Pose}, v. t.]
   1. To lay on; to set or place; to put; to deposit.

            Cakes of salt and barley [she] did impose Within a
            wicker basket.                        --Chapman.

   2. To lay as a charge, burden, tax, duty, obligation,
      command, penalty, etc.; to enjoin; to levy; to inflict;
      as, to impose a toll or tribute.

            What fates impose, that men must needs abide.
                                                  --Shak.

            Death is the penalty imposed.         --Milton.

            Thou on the deep imposest nobler laws. --Waller.

   3. (Eccl.) To lay on, as the hands, in the religious rites of
      confirmation and ordination.

   4. (Print.) To arrange in proper order on a table of stone or
      metal and lock up in a chase for printing; -- said of
      columns or pages of type, forms, etc.

Source : WordNet®

imposed
     adj : set forth authoritatively as obligatory; "the imposed
           taxation"; "rules imposed by society"