Synonyms for Threefold:

adj.

three times as many (adjective)
ternary, triple, treble.
triple (adjective)
ternary, triple, Trebled, three-ply, triplicate.

n.

depleted, gathering, exponential, fourfold, growing, graduated, declining, accumulative, down. threefold (noun)
triple, treble, twofold, three times, multiple, dual, double.

Other synonyms:

Other relevant words:
treble, three times, twofold, ternary, multiple, dual, double.

Usage examples for threefold

  1. And you might remember that I have threefold the strength which emboldens your hunters to incur all the dangers that seem to your fancy so terrible." – Across the Zodiac by Percy Greg
  2. Between 1870 and 1890 the number of newspapers published and the aggregate circulation increased almost exactly threefold about five times as fast as the population was growing. – The United States Since The Civil War by Charles Ramsdell Lingley
  3. If the war became general, and involving several districts, they formed themselves into a threefold division of highway, bush, and sea- fighters. – Samoa, A Hundred Years Ago And Long Before by George Turner