The Collaborative International Dictionary of English v.0.48:

Mounting \Mount"ing\, n.
   1. The act of one that mounts.
      [1913 Webster]

   2. That by which anything is prepared for use, or set off to
      advantage; equipment; embellishment; setting; as, the
      mounting of a sword or diamond.
      [1913 Webster]

   3. (Aeronautics) same as Carriage.
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Mount \Mount\, v. i. [imp. & p. p. Mounted; p. pr. & vb. n.
   Mounting.] [OE. mounten, monten, F. monter, fr. L. mons,
   montis, mountain. See Mount, n. (above).]
   1. To rise on high; to go up; to be upraised or uplifted; to
      tower aloft; to ascend; -- often with up.
      [1913 Webster]

            Though Babylon should mount up to heaven. --Jer. li.
                                                  53.
      [1913 Webster]

            The fire of trees and houses mounts on high.
                                                  --Cowley.
      [1913 Webster]

   2. To get up on anything, as a platform or scaffold;
      especially, to seat one's self on a horse for riding.
      [1913 Webster]

   3. To attain in value; to amount.
      [1913 Webster]

            Bring then these blessings to a strict account,
            Make fair deductions, see to what they mount.
                                                  --Pope.
      [1913 Webster]

WordNet (r) 3.0 (2006):

mounting
    n 1: an event that involves rising to a higher point (as in
         altitude or temperature or intensity etc.) [syn: climb,
         climbing, mounting]
    2: framework used for support or display