Source : Webster's Revised Unabridged Dictionary (1913)

Dilation \Di*la"tion\, n. [L. dilatio. See {Dilatory}.]
   Delay. [Obs.] --Bp. Hall.

Dilation \Di*la"tion\, n. [From dilate, v., cf. {Dilatation},
   {Dilator}.]
   The act of dilating, or the state of being dilated;
   expansion; dilatation. --Mrs. Browning.

         At first her eye with slow dilation rolled. --Tennyson.

         A gigantic dilation of the hateful figure. --Dickens.

Source : WordNet®

dilation
     n 1: a lengthy discussion (spoken or written) on a particular
          topic
     2: the act of expanding an aperture; "the dilation of the pupil
        of the eye" [syn: {dilatation}]