What does concrete mean?
Concrete is fundamentally a building material: a mixture of cement, water, sand, and gravel that hardens into a strong, durable solid used everywhere from foundations and bridges to sidewalks and skyscrapers. It is one of the most widely used man-made materials on Earth. Beyond its literal sense, concrete also works as an adjective meaning real, tangible, or specific — a concrete plan is one with actual details rather than vague intentions, and concrete evidence is proof you can point to directly. This figurative sense makes it invaluable in academic writing, journalism, and everyday discussion whenever someone wants to move from the abstract to the practical. The word can also function as a verb, meaning to solidify or make something permanent, though this usage is less common. Its Latin roots connect it to ideas of growing together or hardening, which captures both its physical nature as a material that sets firm and its metaphorical role as language that grounds ideas in reality.
A hard, grey building material made by mixing cement, sand, gravel, and water, which hardens as it dries.
"They broke up the old concrete to lay new drainage pipes."
Uncountable; do not say 'a concrete' unless referring to a specific slab informally.
Existing in a physical form; tangible rather than abstract, or specific and definite rather than vague.
"The committee wanted concrete proposals, not general principles."
To cover with concrete, or to make something solid, fixed, or permanent.
"They concreting over the back garden to create off-street parking."
Rarely used in the plural; 'concrete' as a noun is almost always uncountable. The plural may occasionally appear in technical contexts referring to different types of concrete mixes.
"Modern engineering relies on high-performance concretes designed for specific load conditions."
The Romans made concrete so well that their 2,000-year-old Pantheon dome is still the largest unreinforced concrete dome in the world — modern concrete would have crumbled centuries ago.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of concrete
Concrete comes from the Latin word 'concretus', the past participle of 'concrescere', meaning 'to grow together' or 'to harden'. This combines the prefix 'com-' (together) with 'crescere' (to grow or increase), the same root that gives us words like crescent and increase. The word entered English in the late Middle Ages as an adjective describing things physically united or solidified, and it was later applied to the building material because of how it hardens as it cures. Cognates appear across Romance languages, including French 'béton' for the material but 'concret' for the adjective, Spanish 'hormigón' for the material alongside 'concreto' for both senses, and Italian 'calcestruzzo' alongside 'concreto'.
How concrete is actually used
As an adjective, 'concrete' contrasts with 'abstract' and often appears in intellectual, academic, or business contexts when distinguishing tangible facts or examples from theoretical ideas. As a noun referring to the building material, it is uncountable ('some concrete,' not 'a concrete'). The verb form is relatively rare and formal. In everyday speech about sidewalks and driveways, Americans sometimes use 'cement' loosely where 'concrete' is technically correct, though this usage is discouraged by engineers and careful writers.
Easily confused with concrete
Cement is the binding powder mixed into concrete, while concrete is the finished composite material containing cement plus sand, gravel, and water.