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Autre dictionnaire
ecology  n 
1 the study of the relationships between living organisms and their environment 
2 the set of relationships of a particular organism with its environment 
3 the study of the relationships between human groups and their physical environment, (Also called (for senses 1, 2))  bionomics  (C19: from German Ökologie, from Greek oikos house (hence, environment)) 
♦  ecologist  n