Why is it called a building when its already built?
The term "building" is actually derived from the verb "to build," which means the process of constructing a structure. Though it may seem a bit counterintuitive, the noun "building" refers to the end result of the construction activity. It is named so because it is a solid, permanent structure that has been created by assembling various materials and components.
If you're curious about linguistic origins of words, one way to find the etymology (origin and history) of a term is to consult an etymological dictionary. Online resources such as Etymonline or Oxford English Dictionary can provide detailed explanations of word origins and how their meanings have evolved over time. Additionally, exploring the history and development of language can be a fascinating way to understand the nuances and quirks of certain words or phrases.