IPA: /ˌɪn.təˈneɪ.ʃən.əl/
KK: /ɪnˈtoʊneɪʃənl/
Related to the rise and fall of the voice in speech, especially in terms of pitch and tone.
The teacher explained the intonational patterns used in different languages.
Intonational is formed from "intonare" (meaning to sound or to utter) and the suffix "-al" (meaning relating to). The word refers to aspects relating to the patterns of pitch in speech.
Think of 'sounding' ('intonare') when you remember that 'intonational' relates to the way we use pitch in speech.