telnetPronunciation: /ˈtɛlnɛt/ ComputingDefinition of telnet noun [mass noun] a network protocol that allows a user on one computer to log into another computer that is part of the same network. [count noun] a program that establishes a connection from one computer to another by means of telnet. [count noun] a link established using a telnet program. verb (telnets, telnetting, telnetted) [no object] informal log into a remote computer using a telnet program. Derivatives telnettable adjective Origin: 1970s: blend of telecommunication and networktelnet in other Oxford dictionaries Definition of telnet in the US English dictionary