in ‧ to ‧ na ‧ tion /ˌɪntəˈneɪʃ ə n/ BrE AmE noun
1 . [uncountable and countable] the way in which the level of your voice changes in order to add meaning to what you are saying, for example by going up at the end of a question:
intonation patterns
2 . [uncountable] technical the playing or singing of correct musical notes