• synonyms


[dahy-ley-shuh n, di-]
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  1. the act of dilating; state of being dilated.
  2. dilatation.
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Origin of dilation

First recorded in 1590–1600; dilate + -ion
Related formsnon·di·la·tion, nouno·ver·di·la·tion, nounself-di·la·tion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for dilation


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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Online Etymology Dictionary, © 2010 Douglas Harper

dilation in Medicine


(dī-lāshən, dĭ-)
  1. The act of expanding or the condition of being expanded.
  2. Dilatation.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

dilation in Science


[dī-lāshən, dĭ-]
  1. The widening or stretching of an opening or a hollow structure in the body.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.