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English word communion comes from Latin communio (communion), which derives from Latin communis (common), which itself probably derives from an old Proto-Indo-European root *mey- (the root has many meanings, e.g. strengthen, fortify, change)
*mey- (Proto-Indo-European)
strengthen; to fix, to build fortifications or fences; change
*ko-moin-i (Proto-Indo-European)
communis (Latin)
(grammar) having both qualities of a subdivided category, such as a verb with both an active and a passive meaning, or a syllable being either long or short.. (of manners) familiar, accessible, courteous. Common, ordinary, commonplace, universal. Democratic; representing the common sentiment. Of or for the community, public.
communio (Latin)
Association, fellowship, community. Communion (all senses) To barricade. To strengthen.
comunion (Old French)
communion (English)
(Christianity) Holy Communion. (Roman Catholicism) A form of ecclestiastical unity between the Roman Church and another, so that the latter is considered part of the former.. A joining together of minds or spirits.