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Webster 1913 Edition

Noun.

The act of one that mounts.

That by which anything is prepared for use, or set off to advantage; equipment; embellishment; setting;

as, the

mounting

of a sword or diamond

ppr.

Rising; soaring; placing on horseback; ascending an eminence; embellishing.

mounting ‎(comparative more mounting, superlative most mounting)

that continues to mount

mounting

mounting ‎(plural mountings)

Something mounted; an attachment.
The act of one who mounts.
- 1834, John Dunmore Lang, An Historical and Statistical Account of New South Wales
  The stage we had now commenced was eighteen miles in length; but the frequent mountings and dismountings, to climb or to descend the rocky sides of the mountains, made it appear much longer.