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.
(see Chapter 5 in MLA Handbook) MLA (Modern Language Association) documentation is a method (or style) of citing your sources; there are other styles such as APA and Chicago. Documentation is important and necessary in order to avoid plagiarism, the theft of someone elseâs words and ideas.