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1.
When tone is applied to a sentence to emphasise sarcasm or wit.
Person in response to tonality -
You dont have to say it with such tonality! I am not two!
by VICKI KARMA November 10, 2006
 
2.
(noun)

(musical term)Refers to a system of pitches within a diatonic scale, based on whole and half-tone relationships to a given tonic, therefore determining the key signature.
Tonality allows you to construct a scale.
by J_E_L January 22, 2006