• 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

Related Words for dilation

extension, expansion

Examples from the Web for dilation

Historical Examples of dilation

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.