Three definitiions: (1) a pitch or note, (2) a whole step, (3) sound production.
tone color or quality of sound: what sound qualities are unique to the sound of various instruments or voice classifications. (Oboe versus tuba, or soprano versus tenor)
the location of a tone in relation to others - a high versus low pitch (or note). Each pitch has its own frequency. Pitch can mean: note, tone, or frequency.
refers to the proper production of a tone so that it is exactly in tune. Also, an intonation can mean a chant or plainsong (such as in the liturgy of a church service).
the scope of notes (lowest to highest) that a player can produce, or that is within a piece of music for a singer or instrumentalist. "That piece has a wide range for my clarinet part."
The transition or break in the voice or clarinet. Voices go from chest voice to head voice, while clarinets go from their low range to their high range using their register key.
the general average range of a composition or of a particular part or voice of a composition. "My clarinet part has a high tessitura on that piece, so I get very tired by the end."