\Sec"u*lar*ize\, v. t. [imp. & p. p. {Secularized}; p. pr. & vb. n. {Secularizing}.] [Cf. F. s['e]culaiser.] 1. To convert from regular or monastic into secular; as, to secularize a priest or a monk. 2. To convert from spiritual or common use; as, to secularize a church, or church property. At the Reformation the abbey was secularized. --W. Coxe. 3. To make worldly or unspiritual. --Bp. Horsley.