From BiblePortal Wikipedia

Webster's Dictionary [1]

(1): ( n.) An established or organized society or corporation; an establishment, especially of a public character, or affecting a community; a foundation; as, a literary institution; a charitable institution; also, a building or the buildings occupied or used by such organization; as, the Smithsonian Institution.

(2): ( n.) Instruction; education.

(3): ( n.) That which institutes or instructs; a textbook; a system of elements or rules; an institute.

(4): ( n.) The act or ceremony of investing a clergyman with the spiritual part of a benefice, by which the care of souls is committed to his charge.

(5): ( n.) The act or process of instituting; as: (a) Establishment; foundation; enactment; as, the institution of a school.

(6): ( n.) That which instituted or established

(7): ( n.) Established order, method, or custom; enactment; ordinance; permanent form of law or polity.

(8): ( n.) Anything forming a characteristic and persistent feature in social or national life or habits.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [2]

an established custom or law; a precept, maxim, or principle. Institutions may be considered as positive, moral, and human.

1. Those are called Positive institutions or precepts which are not founded upon any reasons known to those to whom they are given, or discoverable by them, but which are observed merely because some superior has commanded them.

2. Moral are those, the reasons of which we see, and the duties of which arise out of the nature of the case itself, prior to external command.

3. Human are generally applied to those inventions of men, or means of honoring God, which are not appointed by him, and which are numerous in the Church of Rome, and too many of them in Protestant churches. See Butler's Analogy, P. 214; Doddridge's Lect. lect. 158; Robinson's Claude, 1. 217; 2, 258; Burroughs, Disc. on Positive Institutions;' Bp. Hoadley's Plain Account, p. 3. Institution in Church law means the final and authoritative appointment to a church benefice-more especially a bishopric- by the person with whom such right of appointment ultimately rests. Thus, in the Roman Catholic Church-even after the election of a bishop by the chapter, or his nomination by the crown, when that right belongs to the crown-it is only the pope who confers institution. In English usage, institution is a conveyance of the cure of souls by the bishop, who, or whose deputy, reads the words of the institution, while the clerk kneels. The institution vests the benefice in the clerk, for the purpose of spiritual duty, who thereupon becomes entitled to the profits thereof. But the title is not complete till induction (q.v.).