Fun′da‐men″tal (?), a. [Cf. F. fondamental.] Pertaining to the foundation or basis; serving for the foundation. Hence: Essential, as an element, principle, or law; important; original; elementary; as, a fundamental truth; a fundamental axiom.
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.