What does cement mean?
Cement is a fine grey powder produced by heating limestone with other minerals, most commonly clay, until they fuse into a substance called clinker, which is then ground into a fine dust. When combined with water, sand, and gravel, it acts as a powerful binder that hardens into concrete, making it indispensable to modern construction and one of the most widely manufactured materials in human history. Beyond its literal meaning, the word extends naturally into figurative language: people speak of cementing friendships, alliances, agreements, or reputations, meaning to make them firm and lasting. In medicine and dentistry, specialised cements are used to fix crowns, fill cavities, or bind implants in place. The word carries connotations of strength, permanence, and reliability, which explains its popularity in persuasive and political writing. Because cement is often confused with concrete — the finished material rather than its key ingredient — careful writers keep the two distinct.
A powdery substance made from calcined limestone and clay that hardens when mixed with water and is used to bind building materials together; more broadly, any similar adhesive or binding substance.
"They bought several bags of cement for the patio project."
To join, secure, or strengthen things firmly together, whether physically or metaphorically.
"The treaty helped to cement relations between the two countries."
As a verb, 'cement' frequently appears in formal or journalistic writing when discussing relationships, agreements, or reputations.
'Cement' is usually uncountable when referring to the material itself; the plural 'cements' appears mainly in technical contexts referring to different types or formulations.
"The laboratory tested various cements for durability under wet conditions."
Cement is so essential to modern life that we use more of it than any other man-made material on Earth except water.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cement
The word 'cement' comes from the Latin 'caementum', meaning rough quarry stone or stone chippings, derived from 'caedere', to cut. It entered English in the Middle Ages via Old French, initially referring to mortar or binding material used in building. Its sense broadened over time to cover any adhesive or binding substance, including modern Portland cement, named after the Isle of Portland in England because of its resemblance to Portland stone.
Related word forms
How cement is actually used
In everyday speech, 'cement' is often loosely used to mean concrete, though technically they are different: cement is an ingredient of concrete. As a verb, 'cement' is common in both literal building contexts and figurative ones about strengthening relationships or agreements.
Easily confused with cement
Concrete is the finished building material made by mixing cement with sand, gravel, and water — cement is just one ingredient in concrete.
Mortar is a mixture used to bond bricks or stones together, whereas cement is the powder binder itself.