'mentation' definitions:

Definition of 'mentation'

(from WordNet)
noun
The process of using your mind to consider something carefully; "thinking always made him frown"; "she paused for thought" [syn: thinking, thought, thought process, cerebration, intellection, mentation]

Definition of 'mentation'

From: GCIDE
  • mentation \men*ta"tion\ (m[e^]n*t[=a]"sh[u^]n), n. the process of thinking (especially thinking carefully); mental activity.
  • Syn: thinking, thought, cerebration, intellection. [WordNet 1.5]