Noah Webster's New International Dictionary of the English Language

1. (a.) Overtly and excessively proud; making, or having the disposition to make, exorbitant claims of rank or estimation; giving one's self an undue degree of importance; assuming; haughty; -- applied to persons.

2. (a.) Containing arrogance; marked with arrogance; proceeding from undue claims or self-importance; -- applied to things; as, arrogant pretensions or behavior.