connection (n.)

late 14c., conneccion, "state or fact of being connected," also connexioun (in this spelling from 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 assimilated form of com "together" (see con-) + nectere "to bind, tie" (from PIE root *ned- "to bind, tie").

Spelling shifted from connexion to connection (especially in American English) mid-18c. under influence of connect, abetted by affection, direction, etc. See -xion.

Meaning "act of connecting" is from c. 1600; sense of "anything that connects" is from 1741. As "circle of persons with whom one is brought into more or less intimate relations" is from 1767. Meaning "the meeting of one means of travel with another" is from 1862. Sense of "supplier of narcotics" is attested by 1934.

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Definitions of connection from WordNet

connection (n.)
a relation between things or events (as in the case of one causing the other or sharing features with it);
there was a connection between eating that pickle and having that nightmare
Synonyms: connexion / connectedness
connection (n.)
the state of being connected;
the connection between church and state is inescapable
Synonyms: link / connectedness
connection (n.)
an instrumentality that connects;
he soldered the connection
Synonyms: connexion / connector / connecter / connective
connection (n.)
(usually plural) a person who is influential and to whom you are connected in some way (as by family or friendship);
he has powerful connections
connection (n.)
the process of bringing ideas or events together in memory or imagination;
Synonyms: association / connexion
connection (n.)
a connecting shape;
Synonyms: connexion / link
connection (n.)
a supplier (especially of narcotics);
connection (n.)
shifting from one form of transportation to another;
the plane was late and he missed his connection in Atlanta
Synonyms: connexion
connection (n.)
the act of bringing two things into contact (especially for communication);
there was a connection via the internet
Synonyms: joining / connexion