Deletion is the process of erasing or removing something, like the deletion of all the spam emails from your in-box or a newspaper editor's deletion of extraneous information in a draft of an article.

Deletion is a type of editing, especially when you cross out lines that don't work in a given piece: "I'm just not sure about the deletion of that last paragraph." When it's used in the context of computers, deletion is the loss or removal of data, like the deletion of files that were taking up too much space on your hard drive. In genetics, when a gene or part of a chromosome is missing, that's also a deletion.

Definitions of deletion
  1. noun
    any process whereby sounds or words are left out of spoken words or phrases
    synonyms: omission
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    aphaeresis, apheresis
    (linguistics) omission at the beginning of a word as in `coon' for `raccoon' or `till' for `until'
    the gradual disappearance of an initial (usually unstressed) vowel or syllable as in `squire' for `esquire'
    omission of a sound between two words (usually a vowel and the end of one word or the beginning of the next)
    eclipsis, ellipsis
    omission or suppression of parts of words or sentences
    type of:
    linguistic process
    a process involved in human language
  2. noun
    the act of deleting something written or printed
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    castration, expurgation
    the deletion of objectionable parts from a literary work
    censoring, censorship
    deleting parts of publications or correspondence or theatrical performances
    erasure, expunction, expunging
    deletion by an act of expunging or erasing
    bowdlerisation, bowdlerization
    the act of deleting or modifying all passages considered to be indecent
    censorship in the form of prudish expurgation
    censorship because of perceived obscenity or immorality
    type of:
    remotion, removal
    the act of removing
  3. noun
    the omission that is made when an editorial change shortens a written passage
    “an editor's deletions frequently upset young authors”
    synonyms: cut, excision
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    type of:
    editing, redaction
    putting something (as a literary work or a legislative bill) into acceptable form
  4. noun
    (genetics) the loss or absence of one or more nucleotides from a chromosome
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    type of:
    chromosomal mutation, genetic mutation, mutation
    (genetics) any event that changes genetic structure; any alteration in the inherited nucleic acid sequence of the genotype of an organism
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