(1) The act of constructing something
"During the construction we had to take a detour"
"His hobby was the building of boats"
(2) The commercial activity involved in repairing old structures or constructing new ones
"Their main business is home construction"
"Workers in the building trades"
(3) A structure that has a roof and walls and stands more or less permanently in one place
"There was a three-story building on the corner"
"It was an imposing edifice"
(4) The occupants of a building
"The entire building complained about the noise"