The ability to identify pitch without having to make a comparison to a reference note. Also colloquially called *perfect pitch*. Absolute pitch is often used in contrast to relative pitch, the ability to infer given pitches in relation to others.
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.