Etymology
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hookup (n.)

also hook-up, "connection," 1903, from verbal phrase hook up, which is attested from 1825 in reference to yarn; 1925 as "establish a link with." The noun is from 1922 of radio sets, later of television broadcasts. Modern slang verbal sense of "to meet for sex" is attested by 2003.

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Definitions of hookup

hookup (n.)
a device providing a connection between a power source and a user;
some campsites have electrical hookups for trailers
hookup (n.)
a system of components assembled together for a particular purpose;
Synonyms: assemblage
From wordnet.princeton.edu