Ecosystem

n. ecological system, reciprocal relationship between living things and the environment

An ecosystem is a natural unit consisting of all plants, animals and micro-organisms in an area functioning together with all the non-living physical factors of the environment.
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E·co·sys·tem n. An ecological community together with its environment, functioning as a unit. ecosystem, n the sum total of all living and nonliving [more]Ecosystem - Community and Resources

Noun
1. a system formed by the interaction of a community of organisms with their physical environment
(hypernym) system, scheme

The interacting system of a biological community and its non-living environmental surroundings.