Rationalize /(răsh"ŭn*al*īz)/

Ra·tion·al·ize

Rationalize

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. To render rational; to free from radical signs or quantities. (Alg.)

Rationalize

v. i.
  1. 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.