(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.