Frontness is a binary feature that describes sounds wherein the tongue body is pushed towards the hard palate. The feature is commonly used to describe vowels and contrasts with backness to create natural classes of vocalic segments. In English front vowels include /i/ (as in beet), /ɪ/ (as in bit), /e/ (as in bait), /ɛ/ (as in bed), and /æ/ (as in bad).
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- Ladefoged, D. (2010) A Course in Phonetics. 6th Edition. Wadsworth Publishing.