Emergent Property

Any property which is brought about by some prior state of events.

Example: color is a property that does not exist in-itself, but is rather something that arrises out of a complex set of material events in the world. I.e., a material substratum (e.g., the surface of an apple) that is sufficiently complex to absorb and reflect wavelengths of white light along with a sensor capable of detecting (e.g., an eye) and translating (e.g., a brain) the wavelength data into a perception (the color red).

According to Property Dualism consciousness is a property which emerges out of a particular organization of material substance (e.g., a brain of sufficient complexity).