Meaning

noun a structure that has a roof and walls and stands more or less permanently in one place

noun the act of constructing something

noun the commercial activity involved in repairing old structures or constructing new ones

originFrom Middle English byldynge, buyldyng, byldyng, buldynge, buldyng, boldyng, equivalent to build + -ing. Compare also related Middle English bold (“edifice, castle, mansion”), from Old English bold (“building, dwelling, house”).

Etymology from Wiktionary, CC BY-SA 3.0