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Webster 1913 Edition

Adj.

Having or celebrating a triumph; victorious; triumphant.

–

Tri′umph-ing-ly

adv.

ppr.

Celebrating victory with pomp; vanquishing; rejoicing for victory; insulting on an advantage.

triumphing

triumphing ‎(plural triumphings)

A display of triumph.
- Anthony Trollope, Phineas Finn
  The Finn family could not restrain their triumphings at Killaloe, and I do not know that it would have been natural had they done so.