Webster’s Revised Unabridged Dictionary · 1913
Rationalize
Ra′tion·al·ize (răsh′ŭn·al·īz), v. t. 1. To make rational; also, to convert to rationalism.
2. To interpret in the manner of a rationalist.
3. To form a rational conception of.
4. (Alg.) To render rational; to free from radical signs or quantities.
Ra′tion·al·ize, 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.
Theodore . . . is justly considered the chief rationalizing doctor of antiquity. J. H. Newman.