Pronunciation: (bOO'lē-un), [key]
1. Logic.a deductive logical system, usually applied to classes, in which, under the operations of intersection and symmetric difference, classes are treated as algebraic quantities.
2. Math.a ring with a multiplicative identity in which every element is an idempotent.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.