n. a feature replacing an input string by another string specified by the user, generally as a formal request to a database or search engine

v. substitute a person or thing for (another that is broken or inefficient or lost or no longer working or yielding what is expected); "He replaced the old razor blade"; "We need to replace the secretary that left a month ago"; "the insurance will replace the lost income"; "This antique vase can never be replaced"

v. put something back where it belongs; "replace the book on the shelf after you have finished reading it"; "please put the clean dishes back in the cabinet when you have washed them"

v. put in the place of another; switch seemingly equivalent items; "the con artist replaced the original with a fake Rembrandt"; "substitute regular milk with fat-free milk"; "synonyms can be interchanged without a changing the context's meaning"

v. take the place or move into the position of; "Smith replaced Miller as CEO after Miller left"; "the computer has supplanted the slide rule"; "Mary replaced Susan as the team's captain and the highest-ranked player in the school"

v. to automatically provide a substitute for a string specified by the user