Longman Dictionary of Contemporary English homepage

organism

noun
     
Related topics: Biology
or‧gan‧is‧m S3 [countable]
1 an animal, plant, human, or any other living thing:
All living organisms have to adapt to changes in environmental conditions.
Genes operate together in determining the characteristics of an individual organism.
2 a system made up of parts that are dependent on each other:
A society is essentially an organism.

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