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fenland
fennec
fennel
Fens
fentanyl
fenugreek
fenuron
feoff
feoffee
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Fermat’s principle
Fer·mat's prin·ci·ple


noun 
Definition:
 
principle involving light-ray path: a principle stating that a ray of light passing between two points will follow the path that takes the least time
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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