Etymology

Adjective

1. relating to or used in or intended for trade or commerce;

   a trade fair; trade journals; trade goods.

Noun

1. the commercial exchange (buying and selling on domestic or international markets) of goods and services.
2. the collective people who perform a particular kind of skilled work.

   as they say in the trade.

3. the skilled practice of a practical occupation

   He learned his trade as an apprentice.

4. a particular instance of buying or selling

   I had no further trade with him.

5. the business given to a commercial establishment by its customers

   Even before noon there was considerable trade.

Verb

1. To engage in trade

   This company trades in precious metal.

2. To be traded at a certain price or under certain conditions.

   stock trade

3. To give (something) in exchange for.

   Will you trade your precious watch for my earring?

4. To do business; offer for sale as for one's livelihood.