Tautosyllabicity

Two or more segments are tautosyllabic (with each other) if they occur in the same syllable. For instance, the English word "cat",, is monosyllabic and so its three phonemes , and  are tautosyllabic. They can also be described as sharing a 'tautosyllabic distribution'.

Phonemes that are not tautosyllabic are heterosyllabic. For example, in the English word "mustard", and  are heterosyllabic since they are members of different syllables.