o·mis·sion

[oh-mish-uhn]
noun
1.
the act of omitting.
2.
the state of being omitted.
3.
something left out, not done, or neglected: an important omission in a report.

Origin:
1350–1400; Middle English < Late Latin omissiōn- (stem of omissiō), equivalent to omiss(us) (past participle of omittere to let go; see omit) + -iōn- -ion; see mission

non·o·mis·sion, noun
pre·o·mis·sion, noun

commission, omission.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Omission is an SAT word you need to know.
So is admissible. Does it mean:
that may be allowed or conceded; allowable:
careless
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World English Dictionary
omission (əʊˈmɪʃən) [Click for IPA pronunciation guide]
 
n
1.  something that has been omitted or neglected
2.  the act of omitting or the state of having been omitted
 
[C14: from Latin omissiō, from omittere to omit]
 
o'missive
 
adj
 
o'missiveness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

omission
late 14c., from L. omissionem (nom. omissio) "an omitting," noun of action from omissus, pp. of omittere (see omit).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But every word, every inversion or omission is important.
Not that that necessarily negates anything, but the omission of a link to the
  source research doesn't help with credibility.
While presumably an attempt at levity, such an omission does a disservice to
  these significant years.
But one notable omission in his bill shows the vast economic reach of the
  industry.
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