Phonetic and phonological considerations on the moraic status of pre-NC vowels in Bemba

The pre-NC vowel in many Bantu languages is generally understood to be long. In Bemba, where there is also a vowel length contrast, this raises the question whether the pre-NC vowel is phonetically as long as lexical long vowels and how phonologised this length might be. In contrast to lexically long vowels, pre-NC vowel length is attributed to vowel lengthening resulting from the restructuring of a nasal to create a prenasalised stop. This is thus relevant to whether such stops are treated as unit segments or not. The present paper focuses on the pre-NC vowel and presents an evaluation of whether the pre-NC vowel is monomoraic or bimoraic by considering both phonetic and phonological evidence. Segmental and most tonal evidence leans towards a monomoraic treatment of the pre-NC vowel. One set of tonal data, however, shows variation in moraicity, presenting a mixed picture that we conclude emanates from the intermediate phonetic duration of the pre-NC vowel.