The ability to reason.
Capable of, derived from, or using reason.
Grounded in logic or rationality; rational. In the context of medical therapeutics, it signifies treatment guided by reasoned analysis, in contrast to empirical treatment, which relies on experiential knowledge.
In accordance with logic; logical. In the field of medical therapeutics, it denotes treatment that is founded on reasoning, as opposed to empirical treatment, which relies on past experiences.