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D/F

or DF

1.
direction finding.

D.F.1

1.
Defender of the Faith.
Origin of D.F.1
From the New Latin word Dēfēnsor Fidēī

D.F.2

1.
Distrito Federal.
2.
Doctor of Forestry.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for df

DF

abbreviation
1.
Defender of the Faith

D/F

abbreviation
1.
direction finder
2.
direction finding
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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df in Medicine

df abbr.
decayed and filled (deciduous teeth)

DF abbr.
decayed and filled (permanent teeth)

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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