[{"Bold_text": "noun", "List Items": ["the act or process of adding uniting.", "the process of uniting two or more numbers into one sum, represented by the symbol +.", "the result of adding.Synonyms: accession , increment , enlargement , increase", "something added .Synonyms: appendix , supplement , accession , increment , enlargement , increase", "a wing, room, etc., added to a building, or abutting land added to real estate already owned.", "Chemistry.a reaction in which two or more substances combine to form another compound."]}]