Source : Webster's Revised Unabridged Dictionary (1913)

Filibuster \Fil"i*bus*ter\, v. i. [imp. & p. p. {Fillibustered};
   p. pr. & vb. n. {Filibustering}.]
   1. To act as a filibuster, or military freebooter.
      --Bartlett.

   2. To delay legislation, by dilatory motions or other
      artifices. [political cant or slang, U.S.] --Bartlett.