cardinal vowel

Cardinal vowels are a set of reference points used in phonetics to describe vowel sounds. They are defined by specific tongue positions and auditory qualities, acting as a standard for classifying the vowels of any language.12

There are typically considered to be eight primary cardinal vowels, with some systems expanding to sixteen. These vowels are organized based on the height of the tongue (high, mid, low) and its position in the mouth (front, central, back). For example, cardinal vowel number one represents the highest and most forward tongue position possible without creating a fricative sound, while cardinal vowel number five is the lowest and farthest back.1

These reference points help phoneticians precisely describe and differentiate vowel sounds across various languages, aiding in the study of speech production and perception.12