an act or instance of deleting.
the state of being deleted.
a deleted word, passage, etc.
Genetics. a type of chromosomal aberration in which a segment of the chromosome is removed or lost.

1580–90; < Latin dēlētiōn- (stem of dēlētiō) a destroying, equivalent to dēlēt(us) (see delete) + -iōn- -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deletion (dɪˈliːʃən)
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
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Word Origin & History

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)
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
In both cases, they found a deletion of one particular gene.
It's not ideal but if any model goes against such detections needs
  modification, deletion or re-making.
For every deletion, something that happens during an unequal recombination or
  crossing over, a duplication occurs.
Those with the deletion also had a larger hypothalamus, the part of the brain
  that controls eating and sleep.
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