/it'euh ray"sheuhn/ , n.
1. the act of repeating; a repetition.
2. Math.
a. a problem-solving or computational method in which a succession of approximations, each building on the one preceding, is used to achieve a desired degree of accuracy.
b. an instance of the use of this method.
3. Computers. a repetition of a statement or statements in a program.
[ 1425-75; late ME iteration-, s. of iteratio; see ITERATE, -ION ]