CEREBRATION

thinking, thought, thought process, cerebration, intellection, mentation

(noun) the process of using your mind to consider something carefully; “thinking always made him frown”; “she paused for thought”

Source: WordNet® 3.1

Etymology

Noun

cerebration (countable and uncountable, plural cerebrations)

The act of cerebrating; thinking, reflection, thought.

Source: Wiktionary

Cer`e*bra"tion, n.

Definition: Action of the brain, whether conscious or unconscious.

Source: Webster’s Unabridged Dictionary 1913 Edition