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Definition of mightiness:

  1. Highness; excellency; - with a possessive pronoun, a title of dignity; as, their high mightinesses.
  2. The quality of being mighty; possession of might; power; greatness; high dignity.

Synonyms:

business leader, baron, king, great power, major power, magnate, tycoon, mogul, big businessman, exponent, superpower, world power, ability, index, top executive.

Usage examples: