mommune UK /ˈmɒm.juːn/US /ˈmɑː.mjuːn/ noun1 •A group of mothers, often with their children, that share a communal living space to support each other in parenting, household chores, and other aspects of daily life.needs to form local "mommune" to share chidcare, dinnermaking, driving, etc. We could bake bread and share hand me downs and drink wine... — 2008 formsmommunes