Madurese (bhâsa Madhurâ) is a Malayo-Polynesian language spoken primarily on the island of Madura and a number of regions in East Java, Indonesia. Its further subgrouping has remained a matter of some dispute. Early work placed Madurese in a Malayo-Javanic subgroup containing Javanese, Sundanese, and Malay (Dyen 1963). Glottolog and Ethnologue use the more recent ‘Malayo-Sumbawan’ classification (Adelaar 2005a), which puts Malayic, Chamic, and the Balinese-Sasak-Sumbawa group into one branch with Madurese and Sundanese in two other branches, to the exclusion of Javanese. Robert Blust, rejecting the Malayo-Sumbawan hypothesis, tentatively places Madurese in a Malayo-Chamic subgroup (Blust 2009), but also suggests (Blust 2010) that, as Madurese is lexically similar to Malay but phonologically and morphologically quite different, it may once have subgrouped with Javanese and later underwent heavy relexicalization due to language contact (see also discussion in Kluge 2017: 3).