Common Terms. Ecosystem An ecosystem is any geographic area that includes all of the organisms and nonliving parts of their physical environment. An ecosystem can be a natural wilderness area, a suburban lake or forest, or a heavily used area such as a city.
Definition of documentation for English Language Learners. : 1  the documents, records, etc., that are used to prove something or make something official. : 2  written instructions for using a computer or computer program.
adjective. noun. The definition of documentary is a film or television program that shows a story or situation truthfully. An example of something documentary is evidence that proves someone's alibi during the time of a murder; documentary evidence. A documentary is defined as a film or television program that is educational and tells a true story. An example of a documentary is the An Inconvenient Truth, a movie about global warming.