Pronunciation: (dē"kun-tam'u-nāt"), [key]
—v.t., -nated, -nat•ing.
1. to make (an object or area) safe for unprotected personnel by removing, neutralizing, or destroying any harmful substance, as radioactive material or poisonous gas.
2. to make free of contamination; purify: to decontaminate a sickroom.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.