(1) The Universal Soul or Mind; the spiritual soul (the sixth principle) and therefore the vehicle of Atma, the Spirit, which is the seventh principle, the unifying principle of groups. (2) Buddhi is the Buddhic Plane, the 4th plane of perception of pure intuition, reason or true Love, and the state that all humanity is evolving toward.
Buddhi is a feminine Sanskrit noun derived from the same root (budh â€“ to be awake; to understand; to know) as its more familiar masculine form Buddha. The word signifies a transpersonal faculty of mind higher than the rational mind that might be translated as â€˜intuitive intelligenceâ€™ or simply â€˜higher mindâ€™. It is â€˜that which knowsâ€™, ie, able to discern truth from falsehood.