mightiness

The state or attribute of being mighty; power; greatness; also, high dignity.

A title of dignity: particularly in the phrase their High Mightinesses the States-General of the Netherlands.

Great degree; great amount.

The quality of being mighty; possession of might; power; greatness; high dignity.

Highness; excellency; — with a possessive pronoun, a title of dignity.

The property of being mighty.

physical strength