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Definition of fundamental:

  1. 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.
  2. 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.

Synonyms:

total, positive, crucial, perfect, axiomatic, major, primaeval, unplumbed, sound, vital, central, superficial, vestigial, necessary, surface, principal, key, underlying, unsounded, native, first, significant, heavy, thorough, radical, primal, first harmonic, organic, incidental, original, rudimentary, requisite, constitutional, profound, theoretical, fundamental frequency, wakeless, supporting, requisite, constitutive, basic, cardinal, of import, extreme, thoroughgoing, primitive, primeval, ultimate, primordial, be, natural, innate, unfathomed, structural, implicit in, important.

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