In LATIN ,"Con" becomes "Com" before words beginning with "M", like MENSA

Ouch !!!

This may look almost exactly like my other, soon to be deceased, blog VITA CON MENSA and ..... it is.

But it turns out , in Latin, "Con" becomes "Com" before words that begin with "M" -- like Mensa : hence its commensal not conmensal in language based on Latin, such as modern day English...

Sigh - apologies.