Definition of mightiness:
authority (part of speech: noun)
History describes, and is meant to describe, forces, not proprieties- the mights, the acted realities of men, bad and good- their historical importance depending on their mightiness, not their holiness.- "Thomas Davis, Selections from his Prose and Poetry", Thomas Davis Commentator: T. W. Rolleston.
- "Cecil Castlemaine's Gage, Lady Marabout's Troubles, and Other Stories", Ouida.
You want woman to be a mere lump of sugar, content to be left in a bowl until it pleases you in your high- and- mightiness to take her in the tongs and drop her into the coffee of your existence, to sweeten what would otherwise not please your taste- and like most men you prefer two or three lumps to one.- "The Enchanted Typewriter", John Kendrick Bangs.