There is found in the Rgveda and in later mantra literature, but becoming obsolete later, a root noun is- of frequent occurrence. This is normally interpreted by Sayana as meaning ‘ food ’ (annam), and in conformity with this the modern interpreters usually render the term by ‘ nourishment’ or the like. Though this interpretation seems adequately to suit some passages, a survey of the whole material shows that this is too narrow a sphere of meaning to apply to the word in all its contexts. The central meaning is ‘ thriving, flourishing, prospering, prosperity’. This may apply to that thriving which results from adequate nourishment, to that nourishment itself, or to the force inherent in it. But it may also refer, and more frequently does, to men's thriving in economic, material, or social position, to the possession of riches necessary to maintain this status, and to the riches themselves. It also applies to the fructifying influence of rain or river-water necessary for the maintenance of life.