In various compound legal terms (see infra) this word carries a meaning not essentially different from its signification in the vernacular. In the language of the stock exchange, a broker or speculator is said to be "long" on stock, or as to a particular security, when he has in his possession or control an abundant supply of it, or a supply exceeding the amount which he has … [Read more...]
LONG
TheLaw.com Law Dictionary & Black's Law Dictionary 2nd Ed.