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economical
economically
economics
economise
economism
economist
economize
economy
economy class
economy class syndrome
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economy of scale
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ecology
e·col·o·gy [ i kólləjee ]


noun 
Definition:
 
1. study of organisms and the environment: the study of the relationships between living organisms and their interactions with their natural or developed environment
2. social sciences 
Same as  human ecology
[Late 19th century. < Greek oikos "house, habitation"]

ec·o·log·i·cal [ èkə lójjik'l, kə lójjik'l ] adjective
ec·o·log·i·cal·ly adverb
e·col·o·gist noun
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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