Noun

1. The commercial exchange (buying and selling on domestic or international markets) of goods and services
2. The skilled practice of a practical occupation
3. The business given to a commercial establishment by its customers
4. A particular instance of buying or selling
5. People who perform a particular kind of skilled work
6. Steady winds blowing from east to west above and below the equator
7. An equal exchange

Verb

1. Engage in the trade of
2. Turn in as payment or part payment for a purchase
3. Be traded at a certain price or under certain conditions
4. Exchange or give (something) in exchange for
5. Do business; offer for sale as for one's livelihood