What does "arrogance" mean?

Arrogance: The act or habit of arrogating, or making undue claims in an overbearing manner; that species of pride which consists in exorbitant claims of rank, dignity, estimation, or power, or which exalts the worth or importance of the person to an undue degree; proud contempt of others; lordliness; haughtiness; self-assumption; presumption. I hate not you for her proud arrogance. Shak. See Haughtiness.