mightiness Meaning, Definition & Usage
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noun physical strength
might; power.
WordNet
Might"i*ness noun
Definitions
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The quality of being mighty; possession of might; power; greatness; high dignity. How soon this mightiness meets misery. Shak.
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Highness; excellency; -- with a possessive pronoun, a title of dignity; as, their high .mightinesses