Ratiocinate(v. i.) To reason, esp. deductively; to offer reason or argument.
Ratiocination(n.) The process of reasoning, or deducing conclusions from premises; deductive reasoning.
Ratiocinative(a.) Characterized by, or addicted to, ratiocination; consisting in the comparison of propositions or facts, and the deduction of inferences from the comparison; argumentative; as, a ratiocinative process.
Words within ratiocinations