(1):
(n.) One who traffics on a large scale, especially with foreign countries; a trafficker; a trader.
(2):
(n.) A trading vessel; a merchantman.
(3):
(n.) One who keeps a store or shop for the sale of goods; a shopkeeper.
(4):
(a.) Of, pertaining to, or employed in, trade or merchandise; as, the merchant service.
(5):
(v. i.) To be a merchant; to trade.