What does detergency mean?
Detergency is the technical term for the cleansing power of a substance — its capacity to remove dirt, oil, and other soils from surfaces such as fabric, skin, or hard materials. It derives from the Latin verb tergere, meaning "to wipe," via detergere, "to wipe off." The word belongs mainly to the vocabulary of chemistry and the cleaning-products industry, where researchers measure the detergency of soaps and synthetic detergents by testing how much soil they can lift under controlled conditions. Because ordinary speakers rarely need such a precise term, detergency carries a distinctly formal, scientific register; most people would simply say "cleaning power." Its close relatives include the adjective detergent and the rarer verb deterge, both sharing the same Latin root. For anyone reading product research or surface-science literature, however, detergency is the standard, authoritative way to describe just how well a cleanser cleans.
nounThe cleansing action or power of a substance that removes dirt and grime; the quality of being able to wash away soil from a surface.
- The cleansing action or effectiveness of a detergent or cleaning agent, especially measured in surface science.
"Modern laundry detergents are prized as much for their detergency as for their fragrance."
"The new formula's detergency was tested against a range of greasy stains on cotton."
"In industrial laundries, detergency is often evaluated by measuring soil removal under controlled conditions."
Rarely pluralized; usually treated as an uncountable mass noun referring to cleaning power in general.
"Different detergents exhibit markedly different detergencies across water hardness levels."
Every time your detergent lifts grease off a plate, it's demonstrating its detergency — a word chemists have borrowed straight from the Latin for 'to wipe clean'.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of detergency
Detergency comes from the Latin detergere, formed from de- ("away") plus tergere ("to wipe"), and thus originally meant the act of wiping clean. The noun entered English by way of Late Latin detergentia, alongside the related forms detergent and deterge, all built on the same root. The root also produced the English word terse, which shares the sense of something wiped or polished down. Today detergency survives chiefly as a term of art in chemistry and surface science.
How detergency is actually used
A technical, formal term used chiefly in chemistry, materials science, and the cleaning-products industry rather than in everyday conversation.
Easily confused with detergency
Diligence means careful, persistent effort, whereas detergency is the scientific term for the cleaning power of a substance.
Clemency refers to leniency or mercy, while detergency describes how effectively something washes away dirt.