•Widely cultivated cereal grass, typically Avena sativa.
•Any of the numerous species, varieties, or cultivars of any of several similar grain plants in genus Avena.
•(usually as plural) The seeds of the oat, a grain, harvested as a food crop.
•A simple musical pipe made of oat-straw.
•A mass of oat plants (genus Avena, especially Avena sativa).