13 letters · 22 points in Scrabble
noun the exchange of goods for an agreed sum of money
verb engage in the trade of
originFrom Late Middle English marchaundising (“commerce, trading; commodities, goods; (plural) dealings with other persons”) [and other forms], from marchaundisen (“to engage in commerce, traffic”) (see further at merchandise (verb)) + -ing (suffix forming gerunds). The English word is analysable as merchandise + -ing (suffix forming nouns from verbs).
Etymology from Wiktionary, CC BY-SA 3.0