Pronunciation: (kom'plu-men"tid), [key]
1. having a complement or complements.
2. Math.(of a lattice containing a smallest element and a greatest element) having the property that corresponding to each element of the lattice is a second element such that the greatest lower bound of the two elements is the smallest element of the lattice and the least upper bound of the two elements is the greatest element of the lattice.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.