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.