The Collaborative International Dictionary of English v.0.48:

Titrate \Ti"trate\, v. t. [imp. & p. p. Titrated; p. pr. & vb.
   n. Titrating.] [F. titrer, from titre standard, title. See
   Title, n.] (Chem.)
   To analyse, or determine the strength of, by means of
   standard solutions. Cf. Standardized solution, under
   Solution.
   [1913 Webster]

WordNet (r) 3.0 (2006):

titrate
    v 1: measure by (the volume or concentration of solutions) by
         titration