1. based on exact thinking; - Example: "one's ratiocinative powers"
The Collaborative International Dictionary of English v.0.48:
(r[a^]sh`[i^]*[o^]s"[i^]*n[asl]*t[i^]v), a. [L.
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
The ratiocinative meditativeness of his character.
WordNet (r) 3.0 (2006):
adj 1: based on exact thinking; "one's ratiocinative powers"