the GNU version of the Collaborative International Dictionary of English
n. the process of thinking (especially thinking carefully); mental activity.
The Century Dictionary and Cyclopedia
n. The action or exercise of the mind or of its physical organ; mental activity; ideation; cerebration; intellection.
n. The result of mentation; state of mind.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the process of using your mind to consider something carefully
Word Usage
"Schneidman was interested in what he called "risk writing" - that is, the relationship between writing and suicidal 'mentation' - and wrote a study of the "suicidal logic" of the Italian writer, Cesare Pavese, who committed suicide."