a person having managerial and sometimes policy-making responsibility for the editorial part of a publishing firm or of a newspaper, magazine, or other publication.
the supervisor or conductor of a department of a newspaper, magazine, etc.: the sports editor of a newspaper.
a person who edits material for publication, films, etc.
a device for editing film or magnetic tape.

1640–50; < Medieval Latin, Late Latin: publisher; see edit, -tor

preeditor, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
editor (ˈɛdɪtə)
1.  a person who edits written material for publication
2.  a person in overall charge of the editing and often the policy of a newspaper or periodical
3.  a person in charge of one section of a newspaper or periodical: the sports editor
4.  films
 a.  a person who makes a selection and arrangement of individual shots in order to construct the flowing sequence of images for a film
 b.  a device for editing film, including a viewer and a splicer
5.  television, radio a person in overall control of a programme that consists of various items, such as a news or magazine style programme
6.  a computer program that facilitates the deletion or insertion of data within information already stored in a computer
[C17: from Late Latin: producer, exhibitor, from ēdere to give out, publish, from ē- out + dāre to give]

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

1640s, "publisher," from L. editus, from edere (see edition). By 1712 in sense of "person who prepares written matter for publication;" specific sense in newspapers is from 1803.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

editor definition

A program used to edit a document.
Different types of document have different editors, e.g. a text editor for text files, an image editor for images, an HTML editor for web pages, etc. The term can be used for pretty much any kind of data modification, e.g. a disk sector editor which operates directly on the hard disk, bypassing the filesystem.
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Words from our former senior editor for photography.
Each submission is read carefully before being forwarded to the appropriate
Writers must submit a query letter to the editor in advance.
Finally, the desperate editor sent an equally desperate illustrator to search
  out the writer.
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