ɐ kˈɔːɹnɚstˌoʊn ɪz ɐ sˌɛɹᵻmˈoʊnɪəl mˈeɪsənɹi stˈoʊn sˈɛt ɪn ɐ pɹˈɑːmɪnənt loʊkˈeɪʃən ɔnðɪ aʊtsˈaɪd əvə bˈɪldɪŋ.
A cornerstone is a ceremonial masonry stone set in a prominent location on the outside of a building.