The present study explores the notion of lexical diffusion
in relation to an ongoing change in Modern French nasal vowels.
Data are interviews with 42 Parisians, recorded in 1972–74
and 1989–93. We start with the notion that sound change
ought to be regular, according to the classification of Labov
(1994): that is, being a phonetically gradual change, it should
be lexically abrupt. The first part of our analysis, which includes
more than 10,000 nasal vowel tokens, seems to indicate an influence
of factors compatible with the hypothesis of regular sound change
(i.e., stress and phonetic surroundings). A closer look at the
vowel /[vowel symbol]/, however, reveals an independent lexical and
grammatical conditioning, one not entirely explicable in terms
of stress or phonetics. As other studies have shown (Krishnamurti,
1998; Yaeger-Dror, 1996), gradual phonetic change might show
lexical irregularities, a fact which calls for a revision of
Labov's classification.