In its most extensive signification this word includes all sorts of dealings by way of Bale or exchange. In a more limited sense it signifies the dealings in a particular business, as the India trade; by trade is also understood the business of a particular mechanic, hence boys are said to be put apprentices to learn a trade, as the trade of a carpenter, shoemaker, and the like. Bac. Ab. Master and Servant, D 1. Trade differs from art. 2. It is the policy of the law to encourage trade, and therefore all contracts which restrain the exercise of a man’s talents in trade are detrimental to the commonwealth, and therefore void; though he may bind himself not to exercise a trade in a particular place, for, in this last case, as he may pursue it in another place, the commonwealth has the benefit of it.
TRADE
TheLaw.com Law Dictionary & Black's Law Dictionary 2nd Ed.