The figurative substance of a brain: mental ability, intelligence.
The substance of a brain, as a material or foodstuff.
The intelligent person or people in a group: the director, planner, administrator, etc.
The result or product of being sound.
The property (of an argument) of not only being valid, but also of having true premises.
The property of a logical theory that whenever a wff is a theorem then it must also be valid. Symbolically, letting T represent a theory within logic L, this can be represented as the property that whenever T⊢𝜙 is true, then T vDash 𝜙 must also be true, for any wff φ of logic L.
The state or quality of being sound.