build·ing / ˈbilding/ (abbr.: bldg.) • n. 1. a structure with a roof and walls, such as a house, school, store, or factory.2. the process or business of constructing something: the building of highways [as adj.] building materials. ∎  the process of commissioning, financing, or overseeing the construction of something. ∎  the process of creating or developing something, typically a system or situation, over a period of time: the building of democracy in Guatemala. ∎  the process of increasing the intensity of a feeling: a playwright's cunning in the building of suspense.

Building

a flock of rooks, 1470 [from their nesting habits].