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Relating to reason; not physical; mental. Moral philosophy was his chiefest end; for the rational, the natural, and mathematics . . . were but simple pastimes in comparison of the other. Sir T. North.

An explanation or exposition of the principles of some opinion, action, hypothesis, phenomenon, or like; also, the principles themselves.

The system that makes rational power the ultimate test of truth; -- opposed to sensualism, or sensationalism, and empiricism. Fleming.

One who accepts rationalism as a theory or system; also, disparagingly, a false reasoner. See Citation under Reasonist.

Belonging to, or in accordance with, the principles of rationalism. -- Ra`tion*al*is"tic*al*ly, adv.

The quality or state of being rational; agreement with reason; possession of reason; due exercise of reason; reasonableness. When God has made rationality the common portion of mankind, how came it to be thy inclosure Gov. of Tongue. Well-directed intentions, whose rationalities will never bear a rigid examination. Sir…

The act or process of rationalizing.

To make rational; also, to convert to rationalism.

In a rational manner.

The quality or state of being rational; rationality.

Characterized by aberration.

Relating to emigration.

Pertaining to inspiration.

Not rational; void of reason or understanding; as, brutes are irrational animals.

The quality or state of being irrational. "Brutish irrationaliity." South.

In an irrational manner. Boyle.

Irrationality.

Of or pertaining to respiration; as, respirational difficulties.

conceptions assumed, or presupposed, as prior to experience, in order to make experience rational or possible. A priori, that is, form these necessities of the mind or forms of thinking, which, though first revealed to us by experience, must yet have preëxisted in order to make experience possible. Coleridge.…

Capable of being accounted for; explicable. [R.] True religion . . . intelligible, rational, and accountable, -- not a burden but a privilege. B. Whichcote.