INDEX, in Arithmetic and Algebra, shows to what power any quantity is involved, and is otherwise called its exponent. See ALGEBRA.
INDEX of a Book, is that part annexed to a book, referring to the particular matter or passages therein contained.
INDEX of a Globe, is a little style fitted on to the north pole, and turning round with it, pointing to certain divisions in the hour-circle. It is sometimes also called gnomon. See GLOBE.