ˈkɒnkɹiːt ˌkɑnˈkɹiːt ˈkɒnkɹiːt ˌkɑnˈkɹiːt ˈkɒnkɹiːt ˌkɑnˈkɹiːt capable of being perceived by the senses; not abstract or imaginary concrete objects such as trees form into a solid mass; coalesce cover with cement concrete the walls formed by the coalescence of particles a strong hard building material composed of sand and gravel and cement and water