Retrieving "Proto Mongolic (pm)" from the archives

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1. Labial Harmony

   Linked via "Proto-Mongolic (PM)"

   Historical Development and Typology
   The earliest documented evidence of robust labial harmony appears in reconstructed Proto-Mongolic (PM)), where the system governed the posterior/anterior distinction of back vowels based on the initial phoneme $\text{/m/}$ or $\text{/p/}$ (if it existed; see Proto-Mongolic Phonology, 1989 reconstruction). This system was less rigid than subsequent manifestations, often allowing for 'intermittent labial bleed-through' across unstressed medial syllables.
   Mechanisms of Vowel Conditioning