Would like your opinion, please
 

Would you consider a documentary to be a movie or a TV show?

Depends on where it was first released.

Movie.

Aren't most documentaries shown on TV?

Its a film/ movie/ motion picture.... Sometimes films are created for TV.

EDIT: Documentaries make for good TV shows. ::wink::

I'm more thinking of something along the lines of Fed Up or Jesus Camp which both were released in theatres.

A movie or miniseries. I consider a TV show something ongoing

It can be both. Fahrenheit 9/11, for example, would be a movie, while America The Story of Us would be a T.V. show (under mini-series). The Universe would qualify as an actual T.V. show as it is recurrent, though it is a documentary.

I appreciate all the input!

There are documentary films made for Nat Geo, Animal Planet, Discovery, History Channel, etc., which are purely made-for-TV.

Then there are those which were made for theatrical release and became successful, such as Fahrenheit 9/11, March of the Penguins, An Inconvenient Truth, etc.

Documentaries are basically non-fiction films which document aspects of realities from either day-to-day life or historical/biological aspects. It is basically a film medium, broadly categorised in the manner of release - either as a TV show/series, or as a movie.