Etymology
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traffic (n.)

c. 1500, "trade, commerce," from  French trafique (15c.), from Italian traffico (14c.), from trafficare "carry on trade," of uncertain origin, perhaps from a Vulgar Latin *transfricare "to rub across," from Latin trans "across" (see trans-) + fricare "to rub" (see friction), with the original sense of the Italian verb being "touch repeatedly, handle."

Or the second element may be an unexplained alteration of Latin facere "to make, do." Klein suggests ultimate derivation of the Italian word from Arabic tafriq "distribution." Meaning "people and vehicles coming and going" first recorded 1825. Traffic jam is by 1908, ousting earlier traffic block (1895). Traffic circle is from 1938.

traffic (v.)

1540s, "to buy and sell," from traffic (n.) and preserving the original commercial sense. Related: Trafficked; trafficking; trafficker. The -k- is inserted to preserve the "k" sound of -c- before a suffix beginning in -i-, -y-, or -e- (compare picnic/picnicking, panic/panicky, shellacshellacked).

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Definitions of traffic
1
traffic (n.)
the aggregation of things (pedestrians or vehicles) coming and going in a particular locality during a specified period of time;
traffic (n.)
buying and selling; especially illicit trade;
traffic (n.)
the amount of activity over a communication system during a given period of time;
traffic on the internet is lightest during the night
heavy traffic overloaded the trunk lines
traffic (n.)
social or verbal interchange (usually followed by `with');
Synonyms: dealings
2
traffic (v.)
deal illegally;
traffic drugs
traffic (v.)
trade or deal a commodity;
They trafficked with us for gold
From wordnet.princeton.edu