decomposition
American-
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.
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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.
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See more at detritivore
Etymology
Origin of decomposition
1650–60; probably < French décomposition, derivative of décomposer to decompose; composition
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The researchers found the highest concentrations in the top layer of leaf litter, where decomposition has just begun.
From Science Daily • Mar. 23, 2026
"This hydrogen peroxide decomposition has been used to power large-scale rockets," says Erica Hastings, PhD, postdoctoral fellow in biochemistry in the SFESOM.
From Science Daily • Mar. 19, 2026
The decomposition of her body indicated that she had already been "deceased for several weeks", investigators have said.
From BBC • Feb. 26, 2026
Slower colonization could delay carbon decomposition and reduce habitat formation for the many species that typically live inside Xylophaga burrows.
From Science Daily • Dec. 28, 2025
Cardan gives me a significant look as she explains decomposition, rot.
From "The Cruel Prince" by Holly Black
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
