Webster’s Revised Unabridged Dictionary · 1913
Dilatation
Dil′a·ta′tion (dĭl′ȧ·tā′shŭn), n. [OE. dilatacioun, F. dilatation, L. dilatatio, fr. dilatare. See Dilate, and cf. 2d Dilation.] 1. Prolixity; diffuse discourse. [Obs.] "What needeth greater dilatation?" Chaucer.
2. The act of dilating; expansion; an enlarging on all sides; the state of being dilated; dilation.
3. (Anat.) A dilation or enlargement of a canal or other organ.