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.
Learner's definition of DOCUMENT. [+ object]. 1. : to create a record of (something) through writing, film, photography, etc. Her study was the first to document this type of behavior in gorillas. He wrote a book documenting their struggle. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples.