(1):
(n.) One who works by the job.
(2):
(n.) One who buys goods from importers, wholesalers, or manufacturers, and sells to retailers.
(3):
(n.) One who turns official or public business to private advantage; hence, one who performs low or mercenary work in office, politics, or intrigue.
(4):
(n.) A dealer in the public stocks or funds; a stockjobber.