[1] : The Collaborative International Dictionary of English v.0.48

fundamental \fun"damen`tal\, 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.
   1913 webster

[2] : The Collaborative International Dictionary of English v.0.48

fundamental \fun`damen"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.
   1913 webster

         the fundamental reasons of this war.     --shak.
   1913 webster

         some fundamental antithesis in nature.   --whewell.
   1913 webster

   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.
      1913 webster
see also:
fundamental bass fundamental chord fundamental colors primary colors color 

[3] : WordNet (r) 2.0

fundamental
     adj 1: serving as an essential component; "a cardinal rule"; "the
            central cause of the problem"; "an example that was
            fundamental to the argument"; "computers are
            fundamental to modern industrial structure" syn: cardinal,
             central, key, primal
     2: being or involving basic facts or principles; "the
        fundamental laws of the universe"; "a fundamental
        incompatibility between them"; "these rudimentary truths";
        "underlying principles" syn: rudimentary, underlying
     3: far-reaching and thoroughgoing in effect especially on the
        nature of something; "the fundamental revolution in human
        values that has occurred"; "the book underwent fundamental
        changes"; "committed the fundamental error of confusing
        spending with extravagance"; "profound social changes"
        syn: profound
     n : the lowest tone of a harmonic series syn: fundamental
         frequency, first harmonic
see also:
cardinal central key primal rudimentary underlying 
profound fundamental frequency first harmonic 

[4] : Moby Thesaurus II by Grady Ward, 1.0

239 moby thesaurus words for "fundamental":
   af, ab ovo, abecedarian, aboriginal, antenatal, audio frequency,
   austere, autochthonous, axiom, bare, basal, base, basement, basic,
   basilar, basis, bearing wall, bed, bedding, bedrock, beginning,
   bench mark, bottom, budding, cardinal, cardinal point, center,
   central, chaste, chief thing, climax, component, constituent,
   constitutional, constitutive, core, cornerstone, creative, crisis,
   critical, critical point, crucial, crux, dominant, element,
   elemental, elementary, elements, elixir, embryonic, essence,
   essential, essential matter, factor, fetal, first, floor, flooring,
   flower, focal, focus, fond, footing, formative, foundation,
   foundational, frequency, fundament, fundamental tone, generative,
   genetic, germinal, gestatory, gist, grammar, gravamen, great point,
   ground, grounds, groundwork, gut, hardpan, harmonic, heart,
   high point, homely, homespun, homogeneous, hypostasis, important,
   important thing, in embryo, in its infancy, in ovo, in the bud,
   inaugural, inceptive, inchoate, inchoative, incipient, incunabular,
   indispensable, indivisible, infant, infantile, inherent, initial,
   initiative, initiatory, inner essence, intonation, intrinsic,
   introductory, inventive, irreducible, issue, kernel, keystone,
   landmark, law, life-and-death, life-or-death, main, main point,
   main thing, marrow, material, material point, meat, mere,
   milestone, monolithic, monotone, monotony, nascent, natal,
   necessary, needful, nub, nucleus, nuts and bolts, of a piece,
   of the essence, of vital importance, organic, original, overtone,
   paramount, part and parcel, partial, partial tone, parturient,
   pavement, pitch, pith, pivot, plain, postnatal, postulate,
   pregnant, prenatal, primal, primary, prime, primeval, primitive,
   primogenial, primordial, principal, principium, principle,
   principles, pristine, procreative, protogenic, pure,
   pure and simple, quid, quiddity, quintessence, quintessential,
   radical, real issue, requisite, riprap, rock bottom, rudiment,
   rudimental, rudimentary, rudiments, rule, salient point, sap, seat,
   seminal, severe, sill, simon-pure, simple, sine qua non, single,
   solid ground, solid rock, soul, spare, spirit, stark, stereobate,
   stuff, stylobate, substance, substantial, substantive,
   substantive point, substratum, substruction, substructure,
   terra firma, the bottom line, the nitty-gritty, the point, theorem,
   tone, tonelessness, turning point, unadorned, uncluttered,
   underbuilding, undercarriage, undergirding, underlying,
   underpinning, understruction, understructure, undifferenced,
   undifferentiated, uniform, ur, vital

Fundamental >> F Words
Fundamental, definition of term: Fundamental
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Fundamental Law >> F Words
Fundamental Law, definition of term: Fundamental Law
fundamental+law_pag1.html

Fundamental Fre >> F Words
Fundamental Fre, definition of term: Fundamental Fre
fundamental+fre_pag1.html