Definition of jobber noun from the Oxford Advanced Learner's Dictionary

 

jobber

 noun
noun
BrE BrE//ˈdʒɒbə(r)//
 
; NAmE NAmE//ˈdʒɑːbər//
 
(also stockjobber)(finance)
 
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(in Britain in the past) a person who worked on the stock exchange, buying shares, etc. from brokers and selling them to other brokers compare broker-dealer Word Origin late 17th cent. (in the sense ‘broker, middleman’, originally not derogatory): from job.
See the Oxford Advanced American Dictionary entry: jobber