de·le·tion

[dih-lee-shuhn]
noun
1.
an act or instance of deleting.
2.
the state of being deleted.
3.
a deleted word, passage, etc.
4.
Genetics. a type of chromosomal aberration in which a segment of the chromosome is removed or lost.
Origin:
1580–90; < Latin dēlētiōn- (stem of dēlētiō) a destroying, equivalent to dēlēt(us) (see delete) + -iōn- -ion

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Deletion is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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Collins
World English Dictionary
deletion (dɪˈliːʃən) [Click for IPA pronunciation guide]
 
—n
1.  the act of deleting or fact of being deleted
2.  a deleted passage, word, etc, in text
3.  the loss or absence of a section of a chromosome

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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Etymonline
Word Origin & History

deletion
1580s, from L. deletionem, noun of action from delere (see delete).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

deletion de·le·tion (dĭ-lē'shən)
n.
Loss, as from mutation, of one or more nucleotides from a chromosome.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
And you have more gross genomic features such as gene duplication or deletion.
It's not ideal but if any model goes against such detections needs
  modification, deletion or re-making.
If the puzzle is still available on the network, it will remain on the list
  after deletion.
Until they are handed back without alteration or deletion then a big question
  mark remains over what really happened.
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