concrete concrete /ˈkɑːnkriːt/

adjective

1. () Capable of being perceived by the senses; not abstract or imaginary  ( concrete )
   capable of being perceived by the senses; not abstract or imaginary
    Concrete objects such as trees
   concrete objects such as trees
   
2. Formed by the coalescence of particles  ( concrete )
   formed by the coalescence of particles
   

noun

1. () A strong hard building material composed of sand and gravel and cement and water  ( concrete )
   a strong hard building material composed of sand and gravel and cement and water
     The foundation of the building was made of reinforced concrete.
   The foundation of the building was made of reinforced concrete.
   
   

verb

1. Form into a solid mass; coalesce  ( concrete )
   form into a solid mass; coalesce
   
2. Cover with cement  ( concrete )
   cover with cement
    Concrete the walls
   concrete the walls