ratiocination

Meaning

Reasoning, conscious deliberate inference; the activity or process of reasoning.
Thought or reasoning that is exact, valid and rational.
A proposition arrived at by such thought.

Borrowed from French ratiocination, from Latin ratiōcinātiō ("argumentation, reasoning#Noun"), from ratiōcinātus + -tiō. Ratiōcinātus is the perfect passive participle of ratiōcinor, from ratiō (from reor, possibly from Proto-Italic *rēōr, from Proto-Indo-European *h₂er- ("to put in order")) + -cinor, modelled after vāticinor, equivalent to [[ratiocinate + -ion.

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