Loss of activity, rendering inert by any means; in biochemistry, often refers to inactivation of an enzyme in a chemical reaction either deliberately by medication or pathologically by illness.
Rendering anything inert by using heat or other means.
The procedure of making something inactive. For instance, a fluid with bacteria that has been sterilized by heat, resulting in the elimination of the germs, is termed as inactivated. The process where fresh serum is heated to 56°C for 30 minutes to eradicate its complement is called complement inactivation.