Agathon, To (Greek) The good (principle), the highest or supreme good in a moral sense, summum bonum; Plato's name for that aspect of the divine otherwise called the unmanifest or First Logos. Although sometimes equated with atman, which corresponds to the Greek pneuma, paramatman is a better equivalent for to agathon. It is likewise equivalent to the Buddhist alaya (the indissoluble or everlasting).