merger of Proto-Algonquian (PA *i· and *i to PEA *i·), *o· (from PEA merger of PA *o· and *o ), *e· (from Proto-Algonquian *e·), and *a· (from Proto-Algonquian *a·; the short vowels are*? (from Proto-Algonquian *e), and *a (from Proto-Algonquian *a). This system was continued down to Common Delaware, but Munsee and Unami have innovated separately with respect to the vowel systems.

Contrastive vowel length for Munsee high vowels has been reintroduced, and also for the front mid-vowels. For modern Munsee it is necessary to recognize