The Collaborative International Dictionary of English v.0.48:

Impose \Im*pose"\, v. i.
   To practice tricks or deception.
   [1913 Webster]

   To impose on or To impose upon,
   (a) to pass or put a trick on; to delude; to cheat; to
       defraud. "He imposes on himself, and mistakes words for
       things." --Locke.
   (b) to place an unwelcome burden or obligation on (another
       person); as, she imposed on her friend to drive her
       daughter to school.
   (c) to take unfair advantage of (a person, a friendship); as,
       he imposed on his friendship with The Mayor to gain
       business.
       [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

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.
      [1913 Webster]

            Cakes of salt and barley [she] did impose
            Within a wicker basket.               --Chapman.
      [1913 Webster]

   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.
      [1913 Webster]

            What fates impose, that men must needs abide.
                                                  --Shak.
      [1913 Webster]

            Death is the penalty imposed.         --Milton.
      [1913 Webster]

            Thou on the deep imposest nobler laws. --Waller.
      [1913 Webster]

   3. (Eccl.) To lay on, as the hands, in the religious rites of
      confirmation and ordination.
      [1913 Webster]

   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.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Impose \Im*pose"\, n.
   A command; injunction. [Obs.] --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

impose
    v 1: compel to behave in a certain way; "Social relations impose
         courtesy" [syn: enforce, impose]
    2: impose something unpleasant; "The principal visited his rage
       on the students" [syn: inflict, bring down, visit,
       impose]
    3: impose and collect; "levy a fine" [syn: levy, impose]