terminal (adj.)

mid-15c., "relating to or marking boundaries," from Latin terminalis "pertaining to a boundary or end, final," from terminus "end, boundary line" (see terminus). Meaning "fatal" (terminal illness) is first recorded 1891. Sense of "situated at the extreme end" (of something) is from 1805. Slang meaning "extreme" first recorded 1983. Related: Termninally.

terminal (n.)

"end point of a railway line," 1888, from terminal (adj.); sense of "device for communicating with a computer" is first recorded 1954. Earlier "final part of a word" (1831).

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Definitions of terminal from WordNet
terminal (adj.)
of or relating to or situated at the ends of a delivery route;
freight pickup is a terminal service
terminal charges
terminal (adj.)
relating to or occurring in a term or fixed period of time;
terminal payments
terminal examinations
terminal (adj.)
being or situated at an end;
terminal buds on a branch
the terminal syllable
a terminal station
terminal (adj.)
occurring at or forming an end or termination;
terminal leave
Synonyms: concluding / final / last
terminal (adj.)
causing or ending in or approaching death;
terminal cancer
a terminal patient
terminal (n.)
station where transport vehicles load or unload passengers or goods;
Synonyms: terminus / depot
terminal (n.)
a contact on an electrical device (such as a battery) at which electric current enters or leaves;
Synonyms: pole
terminal (n.)
either extremity of something that has length;
the terminals of the anterior arches of the fornix
Synonyms: end
terminal (n.)
electronic equipment consisting of a device providing access to a computer; has a keyboard and display;