decomposition

noun

1. the act or process of decomposing.
2. the state of being decomposed; decay.

n.

1762, from de- + composition. An earlier word in the same form meant “further compounding of already composite things” (1650s).

n.

1. The act or result of decomposing; disintegration.
2. Separation into constituents by chemical reaction.
3. The breakdown or decay of organic materials; lysis.

1. The separation of a substance into simpler substances or basic elements. Decomposition can be brought about by exposure to heat, light, or chemical or biological activity.
2. The process of breaking down organic material, such as dead plant or animal tissue, into smaller molecules that are available for use by the organisms of an ecosystem. Decomposition is carried on by bacteria, fungi, protists, worms, and certain other organisms. See more at detritivore.