[{"Bold_text": "noun", "List Items": ["a stone two masonry walls at an intersection.", "a stone the nominal starting place in the construction of a monumental building, usually carved with the date and laid with appropriate ceremonies.", "something that is essential, indispensable, or basic:The cornerstone of democratic government is a free press.", "the chief foundation on which something is constructed or developed:The cornerstone of his argument was that all people are created equal."]}]