[dahy-ley-shuhn, di-]
the act of dilating; state of being dilated.

1590–1600; dilate + -ion

nondilation, noun
overdilation, noun
self-dilation, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

1590s, formed from dilate on the mistaken assumption that the -ate in that word was the L. verbal suffix (it is instead part of the stem); the proper form, dilatation, is older (c.1400).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dilation di·la·tion (dī-lā'shən, dĭ-)

  1. The act of expanding or the condition of being expanded.

  2. Dilatation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
dilation   (dī-lā'shən, dĭ-)  Pronunciation Key 
The widening or stretching of an opening or a hollow structure in the body.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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