Intonation

The nature of the pitch characteristic, usually of a performer of music in reference to a musical scale. Good and bad intonation refer to the degree of accuracy between what is actually performed and what is theoretically implied with respect to pitch. See: Flat, Sharp.

In terms of tuning, intonation refers to the process of adjusting the pitches used in a scale so that they are systematically organized.

See: Equal Temperament, Just Intonation, Pythagorean Scale, Tempered Tuning. Compare: Concert Pitch, Perfect Pitch.