WordNet (r) 3.0 (2006):

RFD
    n 1: free government delivery of mail in outlying country areas
         [syn: rural free delivery, RFD]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "RFD":
   PP, RD, airmail, book post, correspondence, direct mail,
   direct-mail selling, express, fourth-class mail, frank,
   halfpenny post, junk mail, letter post, letters, mail,
   mail-order selling, mailing list, newspaper post, parcel post,
   post, post day, registered mail, rural delivery,
   rural free delivery, sea mail, seapost, special delivery,
   special handling, surface mail



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

RFD
       Report Fragmentation Done [bit] (CATNIP, BIT)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

RFD
       Ready-For-Data


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

RFD
       Request For Discussion (Internet, Usenet), "RfD"