1670s, from L. connectere (see connection). Earlier was connex (1540s), from Fr. connexer, from L. *connexare, freq. of conectere (pp. stem connex-). A similar change took place in Fr., where connexer was superseded by connecter. Meaning "to establish a relationship" (with) is from 1881. Slang meaning "get in touch with" is attested by 1926, from telephone connections. Meaning "awaken meaningful emotions, establish rapport" is from 1942. Of a hit or blow, "to reach the target," from c.1920. Related: Connecting (1680s); connectedness (1690s).
To hit someone very hard: He connected with a rude one to the jaw(1930s+)
To buy narcotics or other contraband (1960s+ Narcotics)
To get along with; establish rapport with; click: She's never been able to connect with her tenant(1940s+)
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
connect in Technology
library, networking Unix socket library routine to connect a socket that has been created on the local hosts to one at a specified socket address on the remote host. Unix manual pages: connect(2), accept(2). (1995-03-21)