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ecosystem

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noun
  • ecological unit consisting of a group of plants and living creatures interacting with each other and with their surroundings [Barron]

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Wiktionary:
ecosystem @ wiktionary
WordNet:
ecosystem @ wordnet.princeton.edu
Merriam-Webster Online:
ecosystem @ M-W.com
MSN Encarta:
ecosystem @ Encarta
American Heritage Dictionary of the English Language:
ecosystem @ AHD provided by Yahoo! Education
Answers.com:
ecosystem @ Answers.com
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