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.
Full Definition of DOCUMENT. 1. a archaic: proof, evidence b: an original or official paper relied on as the basis, proof, or support of something c: something (as a photograph or a recording) that serves as evidence or proof. It is important to keep all of your financial documents in a safe place. 2  An important classified document has been leaked to the media. 3  creating a new document on your computer.