The Collaborative International Dictionary of English v.0.48:

ftp \ftp\, FTP \FTP\([e^]f`t[=e]*p[=e]"), n. [acronym from File
   Transfer Protocol.] (Computers)
   An acronym for file transfer protocol, a standardized
   protocol used to allow transmission of files between
   computers; as, send me the file by ftp. It consists of a set
   of coded signals which are transmitted between computers, and
   which inform the receiving computer of the nature of a packet
   of information to be transmitted, and inform the transmitting
   computer when a packet has been successfully received.
   [acronym]
   [PJC] ftp

The Collaborative International Dictionary of English v.0.48:

ftp \ftp\, FTP \FTP\([e^]f`t[=e]*p[=e]"), prop. v. t. [imp. & p.
   p. ftp'd or FTP'd ([e^]f`t[=e]*p[=e]d"); p. pr. & vb. n.
   FTPing or ftp'ing or ftp-ing
   ([e^]f`t[=e]*p[=e]"[i^]ng).] [acronym from File Transfer
   Protocol.] (Computers)
   To send from one computer to another by means of the standard
   file transfer protocol (ftp); as, he ftp'd me the file
   yesterday. [acronym]

   Note: The participle forms have not been standardized, and
         either lower-case or upper-case may be used, but when
         lower-case is used, either a hyphen or apostrophe is
         used before the ed or ing endings.
         [PJC]

WordNet (r) 3.0 (2006):

FTP
    n 1: protocol that allows users to copy files between their
         local system and any system they can reach on the network
         [syn: file transfer protocol, FTP]
    v 1: use the file transfer protocol to transfer data from one
         computer to another; "You can FTP these data"

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

FTP
       File Transfer Protocol (Internet, RFC 959)


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

FTP
       Foiled Twisted Pair [cable] (UTP, TP)


The Free On-line Dictionary of Computing (30 December 2018):

File Transfer Protocol
FTP

   (FTP) A client-server protocol which allows a user on one
   computer to transfer files to and from another computer over a
   TCP/IP network.  Also the client program the user executes
   to transfer files.  It is defined in STD 9, RFC 959.

   See also anonymous FTP, FSP, TFTP.

   Unix manual page: ftp(1).

   (1994-12-01)