fundamentala.[Cf. F. fondamental.] Pertaining to the foundation or basis; serving for the foundation.()The fundamental reasons of this war. (Shak.)Some fundamental antithesis in nature. (Whewell.)Fundamental bass (Mus.), the root note of a chord; a bass formed of the roots or fundamental tones of the chords. -- Fundamental chord (Mus.), a chord, the lowest tone of which is its root. -- Fundamental colors, red, green, and violet-blue. See Primary colors, under Color.()n. A leading or primary principle, rule, law, or article, which serves as the groundwork of a system; essential part, as, the fundamentals of the Christian faith.()