the movement of vehicles, ships, persons, etc., in an area, along a street, through an air lane, over a water route, etc.: the heavy traffic on Main Street.
the vehicles, persons, etc., moving in an area, along a street, etc.
the transportation of goods for the purpose of trade, by sea, land, or air: ships of traffic.
trade; buying and selling; commercial dealings.
trade between different countries or places; commerce.
the business done by a railroad or other carrier in the transportation of freight or passengers.
the aggregate of freight, passengers, telephone or telegraph messages, etc., handled, especially in a given period.
communication, dealings, or contact between persons or groups: traffic between the Democrats and the Republicans.
mutual exchange or communication: traffic in ideas.
trade in some specific commodity or service, often of an illegal nature: the vast traffic in narcotics.
illegal commercial trade in human beings for the purpose of exploiting them: the traffic in young children.
verb (used without object), trafficked, trafficking.
to carry on traffic, trade, or commercial dealings.
to trade or deal in a specific commodity or service, often of an illegal nature (usually followed by in ): to traffic in opium.
verb (used with object), trafficked, trafficking.
(of vehicles or persons) to move over or through (a place): It's a heavily trafficked bridge.
to trade or deal in (a commodity or service): to traffic guns.
to trade in (human beings) for the purpose of exploitation: He was convicted for trafficking illegal immigrants.

1495–1505; earlier traffyk < Middle French trafique (noun), trafiquer (v.) < Italian traffico (noun), trafficare (v.), of disputed orig.

trafficker, noun
trafficless, adjective
intertraffic, noun, verb, intertrafficked, intertrafficking.
untrafficked, adjective

4. See trade. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
traffic (ˈtræfɪk)
1.  a.  the vehicles coming and going in a street, town, etc
 b.  (as modifier): traffic lights
2.  the movement of vehicles, people, etc, in a particular place or for a particular purpose: sea traffic
3.  a.  the business of commercial transportation by land, sea, or air
 b.  the freight, passengers, etc, transported
4.  (usually foll by with) dealings or business: have no traffic with that man
5.  trade, esp of an illicit or improper kind: drug traffic
6.  the aggregate volume of messages transmitted through a communications system in a given period
7.  chiefly (US) the number of customers patronizing a commercial establishment in a given time period
vb , -fics, -ficking, -ficked
8.  (often foll by in) to carry on trade or business, esp of an illicit kind
9.  (usually foll by with) to have dealings
[C16: from Old French trafique, from Old Italian traffico, from trafficare to engage in trade]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1500, "trade, commerce," from M.Fr. trafique (1441), from It. traffico (1323), from trafficare "carry on trade," of uncertain origin, perhaps from a V.L. *transfricare "to rub across" (from L. trans- "across" + fricare "to rub"), with the original sense of the It. verb being "touch repeatedly, handle."
Or the second element may be an unexplained alteration of L. 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. The verb is from 1540s (and preserves the original commercial sense). Traffic jam is 1917, ousting earlier traffic block (1895).
Online Etymology Dictionary, © 2010 Douglas Harper
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