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English definition of “biker”

biker

noun [C]     /ˈbaɪ.kər/ US  /-kɚ/
a member of a group of people riding motorcycles : We were overtaken by a crowd of bikers doing over 90 mph .DriversMotorbikes someone who rides a bicycle , especially a mountain bike Bicycles
(Definition of biker noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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