Universal #210

Legacy number: 210

 Number  210
 Original  A differentiation of rounded vowels according to degree of aperture cannot arise as long as the same opposition is lacking for unrounded vowels.
 Standardized  IF there is no differentiation of unrounded vowels according to degree of aperture, THEN there is no such a difference for the rounded vowels.
 Keywords  rounded, unrounded, vowel, degree of aperture
 Domain  phonology
 Type  implication
 Status  achronic but presumably diachronically motivated
 Quality  statistical
 Basis  languages mentioned in Jakobson 1941
 Source  Jakobson 1941: 56

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Discussion
Notes
1. Explicitly stated as a universal acquisitional sequence, but can be assumed to be intended also as a universal implication. 2. See discussion in Hawkins (1987).
Comment
Frans Plank · 3 Aug 2006
1. Explicitly stated as a universal acquisitional sequence, but can be assumed to be intended also as a universal implication.

2. See discussion in Hawkins 1987.