cosmos2Pronunciation: /ˈkɒzmɒs/Translate cosmos | into German | into Italian | into Spanish Definition of cosmos noun an ornamental plant of the daisy family, which bears single dahlia-like flowers and is native to Mexico and warm regions of America. Genus Cosmos, family Compositae Origin:from Greek kosmos in the sense 'ornament'cosmos in other Oxford dictionaries Definition of cosmos in the US English dictionary