Pronunciation (US) IPA (key): /əbˈzərvətɔri/ (UK) IPA (key): /əbˈzəːvət(ə)ri/ Audio (US)(file) Noun Singular observatory Plural observatories (countable) An observatory is a building where people can observe things related to space, such as stars and planets. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads