one-dimensional vowel system (inglese) three-dimensional vowel system (inglese)
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Much commoner are ‘two-dimensional’ systems, where some second type of contrast intersects, wholly or partly, the differentiation by tongue height. The simplest system of this sort has three vowels: two high and one low, the former pair contrasting as front unrounded and back rounded. - Hockett (1958), a pag.95