[{"Bold_text": "adjective", "List Items": ["serving as, or being an essential part of, a foundation or basis; basic; underlying:fundamental principles;the fundamental structure.Synonyms: primary , indispensable", "of, relating to, or affecting the foundation or basis:a fundamental revision.", "being an original or primary source:a fundamental idea.", "Music.(of a chord) having its root as its lowest note."]}, {"Bold_text": "noun", "List Items": ["a basic principle, rule, law, or the like, that serves as the groundwork of a system; essential part:to master the fundamentals of a trade.", "Also calledfundamental note,.Music.the root of a chord.the generator of a series of harmonics.", "the root of a chord.", "the generator of a series of harmonics.", "Physics.the component of lowest frequency in a composite wave."]}]