Ecology is the study of the relationships between living organisms, including humans, and their physical environment; it seeks to understand the vital connections between plants and animals and the world around them.
In Common Usage. documentation is one of the 10000 most commonly used words in the Collins dictionary.
Definition of document for Students. 1  1 : a written or printed paper that gives information about or proof of something Your birth certificate is a legal document. 2  2 : a computer file containing data entered by a user.