n.
In linguistics , a variation in the pitch of the voice while speaking.
The term is usually applied to languages (called tone languages) in which pitch differentiates words with an identical sequences of consonants and vowels. For example, man in Mandarin Chinese may mean either "deceive" or "slow," depending on its pitch. In tone languages, what matters is not absolute pitch but the pitch of one word relative to another or how pitch changes within a word.