Pronunciation: (pru-lif'u-rāt"), [key]
—v.i., v.t., -at•ed, -at•ing.
1. to grow or produce by multiplication of parts, as in budding or cell division, or by procreation.
2. to increase in number or spread rapidly and often excessively.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.