What does purity mean?
Purity is the quality or state of being pure. In scientific and industrial contexts, it describes a material or substance that contains no impurities, contaminants, or unwanted components. In moral and religious contexts, purity can mean innocence, chastity, sincerity, or freedom from corruption. It also applies more broadly to styles, traditions, languages, and forms of art, where it suggests that something is unaltered, simple, and free from elements considered inappropriate or inauthentic. The word often carries a formal or elevated tone, especially when it describes a person's character or motives. Expressions such as “purity of purpose” and “purity of intent” emphasize sincerity and integrity, while “purity test” refers to a procedure for determining a substance's composition or authenticity. Overall, purity suggests both literal cleanliness and an idealized absence of corruption, though its moral uses may require careful attention to cultural context.
nounThe state or quality of being free from impurities, contamination, or adulterating substances. It can also refer to moral innocence, chastity, or the unaltered simplicity of a style, practice, or material.
- The state of being free from dirt, impurities, contamination, or adulterating substances.
- Moral innocence, chastity, or freedom from corruption.
- The quality of a style, form, or material being simple, unaltered, and free from foreign or inappropriate elements.
"The purity of the spring water was confirmed by independent laboratory tests."
"The laboratory used several methods to verify the purity of the sample."
"She questioned the purity of his motives and wondered whether he was acting without self-interest."
The plural is grammatically standard but uncommon in ordinary use.
"The chemist compared the purities of the two compounds."
From Latin purus, meaning “clean,” purity has long carried a double meaning: what is physically unspoiled and what is morally beyond suspicion.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does purity come from?
The word entered Middle English in the form “puritee,” borrowed through Anglo-French from Latin “puritas,” a noun formed from “purus,” meaning “clean” or “pure.” The Latin root also underlies related English words such as “pure,” “purify,” “purge,” and “impure.” Over time, “purity” expanded beyond physical cleanliness to encompass moral innocence, religious purity, and the simplicity or authenticity of artistic and linguistic forms.
How purity is actually used
The word is common in formal, literary, religious, scientific, and quality-control contexts. Its moral associations can be strongly traditional, and expressions involving sexual or racial purity may sound historical or ideological rather than neutral.