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dilation (n.)

"act of dilating," 1590s, formed from dilate on the mistaken assumption that the -ate in that word was the Latin verbal suffix (it is instead part of the stem); the proper form, dilatation, is older (c. 1400).

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Definitions of dilation from WordNet

dilation (n.)
a lengthy discussion (spoken or written) on a particular topic;
dilation (n.)
the act of expanding an aperture;
the dilation of the pupil of the eye
Synonyms: dilatation
From wordnet.princeton.edu