ide·al·i·ty \ˌīdēˈaləd.ə, -diˈa-, -ətē, -i\noun (-es) Etymology:ideal (I) + -ity 1. a.: the quality or state of being ideal b.: existence only in idea 2.: something imaginary or idealized : an unreal or unrealistic thing or concept 3.: the poetic or creative faculty — used originally in phrenology