Definition of editor noun from the Oxford Advanced Learner's Dictionary
editor
noun
ˈedɪtə(r) ˈedɪtər
1a person who is in charge of a newspaper, magazine, etc, or part of one, and who decides what should be includedthe editor of the Washington Postthe sports/financial/fashion, etc. editor2a person who prepares a book to be published, for example by checking and correcting the text, making improvements, etc. see also copy editor, subeditor3a person who prepares a film/movie, radio or television programme for being shown or broadcast by deciding what to include, and what order it should be in4a person who works as a journalist for radio or television reporting on a particular area of newsour economics editor5a person who chooses texts written by one or by several writers and prepares them to be published in a bookShe's the editor of a new collection of ghost stories.6(computing) a program that allows you to change stored text or dataeditorship
ˈedɪtə(r) 
ˈedɪtər 
1 a person who is in charge of a newspaper, magazine, etc, or part of one, and who decides what should be includedthe editor of the Washington Postthe sports/financial/fashion, etc. editor