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free agent
free alongside ship
free and clear
free-and-easy
free ascent
free association
Free Church
free climbing
free electron
free energy
free enterprise
free fall
free-fall
free-fire zone
free flight
free-floating
free-floating anxiety
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free electron
free e·lec·tron (plural free e·lec·trons)


noun 
Definition:
 
electron not bonded to atom: an electron that is not bonded to an atom or molecule and so is free to move under external electric or magnetic fields
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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