† iˈdealtyObs.rare. [f. ideal a. + -ty; cf.royalty, etc.] A standard of excellence, an ideal. 1635J. Hayward tr.Biondi's Banish'd Virg. iii. 168 The world had now no more neede of any other exquisite patterne for the well-governing of Common-wealths, and Idealty of Princes.