The ability to identify [tag:pitch] without having to make a comparison to a reference note. Also colloquially called *perfect pitch*.
Absolute pitch, also colloquially called perfect pitch, is the ability to directly identify musical pitch. To count as absolute pitch, this must be without having to make a comparison to a reference note extrinsic to the mind (such as a musical instrument or muscle memory in the vocal cords). More precisely, it is the ability to identify pitch class, rather than to directly estimate frequency.