noesis
Noesis (noun) means the process of thinking or using the mind to understand things.
Etymology
A learned borrowing from Ancient Greek νόησις (nóēsis), meaning "concept", "idea", "intelligence" or "understanding", from νοεῖν (noeîn), "to intend", "to perceive", "to see" or "to understand" (itself from νοῦς (noûs), "mind", "thought", from νόος (nóos)), plus -σις (-sis), a suffix forming nouns of action.