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late 14c., conneccion, later connexioun (mid-15c.), from Old French connexion, from Latin connexionem (nominative connexio) "a binding or joining together," from *connexare, frequentative of conectere "to fasten together, to tie, join together," from com- "together" (see com-) + nectere "to bind, tie" (see nexus).
Spelling shifted from connexion to connection (especially in American English) mid-18c. under influence of connect, abetted by affection, direction, etc.
connection con·nec·tion (kə-něk'shən)
The act of connecting or the state of being connected.
Something that connects.