Source : Webster's Revised Unabridged Dictionary (1913)

Imposing \Im*pos"ing\, a.
   1. Laying as a duty; enjoining.

   2. Adapted to impress forcibly; impressive; commanding; as,
      an imposing air; an imposing spectacle. ``Large and
      imposing edifices.'' --Bp. Hobart.

   3. Deceiving; deluding; misleading.

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.

Imposing \Im*pos"ing\, n. (Print.)
   The act of imposing the columns of a page, or the pages of a
   sheet. See {Impose}, v. t., 4.

   {Imposing stone} (Print.), the stone on which the pages or
      columns of types are imposed or made into forms; -- called
      also {imposing table}.

Source : WordNet®

imposing
     adj 1: impressive in appearance; "a baronial mansion"; "an imposing
            residence"; "a noble tree"; "severe-looking policemen
            sat astride noble horses"; "stately columns" [syn: {baronial},
             {noble}, {stately}]
     2: used of a person's appearance or behavior; befitting an
        eminent person; "his distinguished bearing"; "the
        monarch's imposing presence"; "she reigned in magisterial
        beauty" [syn: {distinguished}, {magisterial}]