What is College?

Legal Definition
College (Latin: collegium) is an educational institution or a constituent part of one. A college may be a degree-awarding tertiary educational institution, a part of a collegiate or federal university, or an institution offering vocational education.

In the United States "college" refers to a constituent part of a university, but generally "college" and "university" are used interchangeably, whereas in the United Kingdom, Oceania and South Asia, "college" may refer to a secondary or high school, a college of further education, a training institution that awards trade qualifications, a higher education provider that does not have university status (often without its own degree-awarding powers), or a constituent part of a university (See this comparison of British and American English educational terminology for further information).
-- Wikipedia
Legal Definition
A civil corporation, society or company, authorized by law, having in general a literary object. In some countries by college is understood the union of certain voters in *one body; such bodies are called electoral colleges; as, the college of electors or their deputies to the diet of Ratisbon; the college of cardinals. The term is used in the United States; as, the college of electors of president and vice-president, of the United States. Act of Congress of January 23, 1845.
-- Bouviers Law Dictionary
Legal Definition
An organized assembly or collection of persons, established by law, and empowered to co-operate for the performance of some special function or for the promotion of some common object, which may be educational, political, ecclesiastical or scientific in its character. The assemblage of the cardinals at Rome is called a "college." So, in the United States, the body of presidential electors is called the "electoral college." In the most common use of the word, it designates an institution of learning (usually incorporated) which offer 'instruction in the liberal arts and humanities and in' scientific branches, but not in the technical arts or those studies preparatory to admission to the professions. Com. v. Banks, 198 Pa. 397, 48 Atl. 277; Chegaray v. New York, 13 N. Y. 229; Northampton County v. Lafayette College, 128 Pa. 132, 18 Atl. 516.

In England, it is a civil corporation, company or society of men, having certain privileges, and endowed with certain revenues, founded by royal license. An assemblage of several of these colleges is called a "university." Wharton.
-- Black's Law Dictionary