The Collaborative International Dictionary of English v.0.48:

Lecture \Lec"ture\, v. t. [imp. & p. p. Lectured (-t[-u]rd);
   p. pr. & vb. n. Lecturing.]
   1. To read or deliver a lecture to.
      [1913 Webster]

   2. To reprove formally and with authority.
      [1913 Webster]

WordNet (r) 3.0 (2006):

lecturing
    n 1: teaching by giving a discourse on some subject (typically
         to a class) [syn: lecture, lecturing]