[{"Bold_text": "adjective", "List Items": ["consisting of four.", "arranged in fours.", "(initial capital letter)Geology.noting or pertaining to the present period of earth history, forming the latter part of the Cenozoic Era, originating about 2 million years ago and including the Recent and Pleistocene Epochs.", "Metallurgy.(of an alloy) having four principal constituents."]}, {"Bold_text": "noun", "List Items": ["a group of four.", "the number four.", "(initial capital letter)Geology.the Quaternary Period or System."]}, {"Bold_text": "Noun", "List Items": null}, {"Bold_text": "Adjective", "List Items": null}]