Definition of a documentary

After being given the Brief i found some definitions on the interenet to see what a documentary actually is.

http://www.thefreedictionary.com/documentary:

• Communication Arts / Broadcasting) a factual film or television programme about an event, person, etc., presenting the facts with little or no fiction

• resenting factual material with little or no fictional additions

http://en.wikipedia.org/wiki/Documentary_film:

• Documentary film is a broad category of visual expressions that is based on the attempt, in one fashion or another, to document reality.
  

http://www.answers.com/topic/documentary:

• Presenting facts objectively without editorializing or inserting fictional matter, as in a book or film.

• A work, such as a film or television program, presenting political, social, or historical subject matter in a factual and informative manner and often consisting of actual news films or interviews accompanied by narration.
  

http://www.yourdictionary.com/documentary:

• designating or of a film, TV program, etc. that dramatically shows or analyzes news events, social conditions, etc., with little or no fictionalization