di·la·tion

[dahy-ley-shuhn, di-]
noun
1.
the act of dilating; state of being dilated.

Origin:
1590–1600; dilate + -ion

non·di·la·tion, noun
o·ver·di·la·tion, noun
self-di·la·tion, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
dilate (daɪˈleɪt, dɪ-) [Click for IPA pronunciation guide]
 
vb
1.  to expand or cause to expand; make or become wider or larger: the pupil of the eye dilates in the dark
2.  (intr; often foll by on or upon) to speak or write at length; expand or enlarge
 
[C14: from Latin dīlātāre to spread out, amplify, from dis- apart + lātus wide]
 
di'latable
 
adj
 
dilata'bility
 
n
 
di'latableness
 
n
 
di'lation
 
n
 
dilatation
 
n
 
dila'tational
 
adj
 
dilative
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Dilation is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
the offspring of a zebra and a donkey.
Etymonline
Word Origin & History

dilation
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-)
n.

  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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Example sentences
It has been suggested that the time dilation in the early universe may allow
  light to exceed the established speed limit.
Faster and faster also means entering time dilation relativistic lag with the
  computer.
Actually time dilation is measurable even at slower speed.
Chemicals in the venom result in the dilation of blood vessels, causing fluids
  to seep into the surrounding tissue.
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