macrocosm n. + Add to list macro·cosm SynonymsEtymology Synonyms cosmoscreationexistenceuniverseworldOriginGRKμακρός→LA-MEDmacrocosmus→OFRmacrocosme→FRMmacrocosme→ENmacrocosm From Middle French macrocosme (from Old French macrocosme) and Medieval Latin macrocosmus, formed from Ancient Greek μακρός (makrós, “great, long”) + κόσμος (kósmos, “universe, order”).