v. t. - To make rational; also, to convert to rationalism.
v. t. - To interpret in the manner of a rationalist.
v. t. - To form a rational conception of.
v. t. - To render rational; to free from radical signs or quantities.
v. i. - To use, and rely on, reason in forming a theory, belief, etc., especially in matters of religion: to accord with the principles of rationalism.