The Collaborative International Dictionary of English v.0.48:

Dogmatize \Dog"ma*tize\, v. i. [imp. & p. p. Dogmatized; p.
   pr. & vb. n. Dogmatizing.] [L. dogmatizare to lay down an
   opinion, Gr. ?, fr. ?: cf. F. dogmatiser. See Dogma.]
   To assert positively; to teach magisterially or with bold and
   undue confidence; to advance with arrogance.
   [1913 Webster]

         The pride of dogmatizing schools.        --Blackmore.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dogmatize \Dog"ma*tize\, v. t.
   To deliver as a dogma. [R.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

dogmatize
    v 1: state as a dogma [syn: dogmatize, dogmatise]
    2: speak dogmatically [syn: dogmatize, dogmatise]