Definition of cardinal vowel in English:

cardinal vowel

Line breaks: car|dinal vowel

Entry from British & World English dictionary

noun

Phonetics
Each of a series of vowel sounds used as a standard reference point to assist in the description and classification of vowel sounds in any language.

Definition of cardinal vowel in:

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Word of the day flippant
Pronunciation: ˈflipənt
adjective
not showing a serious or respectful attitude