Definition
The [+/- back] feature is used to refer to segments that are articulated with the tongue body moved back in the vocal tract from neutral position (Zsiga, 2013, p. 268).
[-back] vowels include [i, ɪ, e, ɛ, æ]. [+back] vowels are all those articulated with the tongue moved back and central vowels, such as [u, ɨ, o, ʌ, a] (p. 268).
Examples
- Hul’q’umi’num’
- The following phonemes that are enclosed in blue can be described as being [+back].

- Skwxwú7mesh
- The following phonemes that are enclosed in blue can be described as being [+back].

- Secwepemctsín
- The following phonemes that are enclosed in blue can be described as being [+back].
