Added 9 October 2026 mentation noun Categories: Mind & IdeasRare Words noun ! Definition from Wiktionary (CC BY-SA). More about mentation at Wordnik → Where our words come from → Mental activity or mental state, including cognition or, more specifically, thinking. Related Words: thoughtintellectionthinkingcerebrationbethinkingmindhoodideametathinkingmentalizationthink Back to today's word