IPA: /ˌreɪʃiˈoʊsɪˌneɪt/
KK: /ˈrætʃiəˌneɪt/
To think carefully and logically about something in order to understand it or make a decision.
She likes to ratiocinate before making important choices.
Past: ratiocinated
Past Participle: ratiocinated
Ratiocinate → It is formed from "ratio" (from Latin, meaning reason or calculation) and "-cinate" (from Latin "cinate", meaning to move or to act). The word describes the act of reasoning or thinking logically through a process of calculation.
Think of 'reason' ('ratio') and 'acting' ('cinate') together — that's how ratiocinate means to think or reason logically.