What does adulteration mean?
Adulteration is the act of degrading the quality or purity of a substance — most often food, drink, or medicine — by mixing it with an inferior, cheaper, or foreign material. The word is chiefly formal and technical, appearing frequently in legal statutes, food-safety regulations, and scientific literature: one speaks of the adulteration of milk with water, of olive oil diluted with cheaper oils, or of spices bulked out with inert powders. By extension, it can describe any debasement of something once pure or genuine, including figurative uses about language or culture. The term carries strong connotations of fraud and deception, since adulteration typically serves to increase profit at the consumer's expense. Historically significant — 19th-century campaigns against adulterated bread and beer helped create modern food law — the word remains central to contemporary debates over product authenticity and supply-chain integrity.
nounThe act or process of making something impure or of inferior quality by adding a foreign or inferior substance, especially food, drink, or drugs. It also refers to the state of being so debased.
- The act or process of adding an inferior or foreign substance to something (especially food, drink, or medicine), thereby reducing its quality or purity.
- The resulting state of a substance that has been debased in this way; an instance of such contamination.
"Victorian inspectors uncovered widespread adulteration of bread with chalk and alum."
"Regulators fined the dairy after tests revealed the adulteration of its milk with water."
"The spice merchant was prosecuted for the adulteration of saffron with dyed corn silk."
The plural is uncommon because adulteration usually functions as an uncountable mass noun referring to the general practice. When pluralized, it refers to multiple specific instances or types of adulteration, typically in legal or historical writing.
"The report catalogued numerous adulterations discovered across the city's bakeries."
In 19th-century Britain, your daily bread could legally contain chalk, plaster, and sawdust — until the Adulteration of Food and Drugs Act made faking your flour a crime.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of adulteration
Adulteration derives from the Latin verb 'adulterare', meaning to corrupt, falsify, or pollute, formed from 'ad-' (toward) plus 'alter' (other), literally suggesting a turning toward something other than the genuine article. English adopted the noun in the early modern period, around the late 16th or early 17th century, alongside the related verb 'adulterate'. The same Latin root gives us 'adultery', which originally carried the broader sense of corruption or falsification before narrowing to its marital sense, as well as 'adulterant', a term for the inferior substance added during adulteration.
Related word forms
How adulteration is actually used
Adulteration is a formal, largely technical term used in law, food science, pharmacology, and consumer-protection contexts. It carries strongly negative connotations of fraud and deception. In everyday speech, speakers more often use words like 'contamination' or say something has been 'watered down'.
Easily confused with adulteration
Adultery means voluntary sexual intercourse between a married person and someone who is not their spouse, whereas adulteration means the debasing of a substance by adding something inferior.