Pronunciation (UK) IPA (key): /ˈtreɪdə(r)/ (US) IPA (key): /ˈtreɪɾɚ/ Audio (UK)(file) Homophone: traitor Noun Singular trader Plural traders (countable) A trader is someone who tries to make a profit by buying something at a low price and then selling it at a higher price. Synonym: merchant Many traders often come to this market to sell their goods. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads