Oxford Advanced Learner's Dictionary, 8th edition

 traf • fic noun, verb BrE /ˈtræfɪk/ NAmE /ˈtræfɪk/ noun [uncountable] 1 the vehicles that are on a road at a particular time heavy/rush-hour traffic local/through traffic There's always a lot of traffic at this time of day. They were stuck in traffic and missed their flight. a plan to reduce traffic congestion traffic police (= who control traffic on a road or stop drivers who are breaking the law) The delay is due simply to the volume of traffic. We got used to the constant noise of the traffic. 2 the movement of ships, trains, aircraft, etc. along a particular route transatlantic traffic air traffic control 3 the movement of people or goods from one place to another commuter/freight/passenger traffic the traffic of goods between one country and another 4 the movement of messages and signals through an electronic communication system the computer servers that manage global Internet traffic Telecom operators have upgraded their networks to improve their capacity as data traffic increases. 5 ~ (in sth) illegal trade in sth the traffic in firearms verb