Source : Webster's Revised Unabridged Dictionary (1913)

Natural \Nat"u*ral\ (?; 135), a. [OE. naturel, F. naturel, fr.
   L. naturalis, fr. natura. See {Nature}.]
   1. Fixed or determined by nature; pertaining to the
      constitution of a thing; belonging to native character;
      according to nature; essential; characteristic; not
      artifical, foreign, assumed, put on, or acquired; as, the
      natural growth of animals or plants; the natural motion of
      a gravitating body; natural strength or disposition; the
      natural heat of the body; natural color.

            With strong natural sense, and rare force of will.
                                                  --Macaulay.

   2. Conformed to the order, laws, or actual facts, of nature;
      consonant to the methods of nature; according to the
      stated course of things, or in accordance with the laws
      which govern events, feelings, etc.; not exceptional or
      violent; legitimate; normal; regular; as, the natural
      consequence of crime; a natural death.

            What can be more natural than the circumstances in
            the behavior of those women who had lost their
            husbands on this fatal day?           --Addison.

   3. Having to do with existing system to things; dealing with,
      or derived from, the creation, or the world of matter and
      mind, as known by man; within the scope of human reason or
      experience; not supernatural; as, a natural law; natural
      science; history, theology.

            I call that natural religion which men might know .
            . . by the mere principles of reason, improved by
            consideration and experience, without the help of
            revelation.                           --Bp. Wilkins.

   4. Conformed to truth or reality; as:
      (a) Springing from true sentiment; not artifical or
          exaggerated; -- said of action, delivery, etc.; as, a
          natural gesture, tone, etc.
      (b) Resembling the object imitated; true to nature;
          according to the life; -- said of anything copied or
          imitated; as, a portrait is natural.

   5. Having the character or sentiments properly belonging to
      one's position; not unnatural in feelings.

            To leave his wife, to leave his babes, . . . He
            wants the natural touch.              --Shak.

   6. Connected by the ties of consanguinity. ``Natural
      friends.'' --J. H. Newman.

   7. Begotten without the sanction of law; born out of wedlock;
      illegitimate; bastard; as, a natural child.

   8. Of or pertaining to the lower or animal nature, as
      contrasted with the higher or moral powers, or that which
      is spiritual; being in a state of nature; unregenerate.

            The natural man receiveth not the things of the
            Spirit of God.                        --1 Cor. ii.
                                                  14.

   9. (Math.) Belonging to, to be taken in, or referred to, some
      system, in which the base is 1; -- said or certain
      functions or numbers; as, natural numbers, those
      commencing at 1; natural sines, cosines, etc., those taken
      in arcs whose radii are 1.

Natural \Nat"u*ral\ (?; 135), n.
   1. A native; an aboriginal. [Obs.] --Sir W. Raleigh.

   2. pl. Natural gifts, impulses, etc. [Obs.] --Fuller.

   3. One born without the usual powers of reason or
      understanding; an idiot. ``The minds of naturals.''
      --Locke.

   4. (Mus.) A character [[natural]] used to contradict, or to
      remove the effect of, a sharp or flat which has preceded
      it, and to restore the unaltered note.

Source : WordNet®

natural
     adj 1: in accordance with nature; relating to or concerning nature;
            "a very natural development"; "our natural
            environment"; "natural science"; "natural resources";
            "natural cliffs"; "natural phenomena" [ant: {unnatural}]
     2: existing in or produced by nature; not artificial or
        imitation; "a natural pearl"; "natural gas"; "natural
        silk"; "natural blonde hair"; "a natural sweetener";
        "natural fertilizers" [ant: {artificial}]
     3: existing in or in conformity with nature or the observable
        world; neither supernatural nor magical; "a perfectly
        natural explanation" [ant: {supernatural}]
     4: functioning or occurring in a normal way; lacking
        abnormalities or deficiencies; "it's the natural thing to
        happen"; "natural immunity"; "a grandparent's natural
        affection for a grandchild"
     5: of a key containing no sharps or flats; "B natural" [ant: {sharp},
         {flat}]
     6: unthinking; prompted by (or as if by) instinct; "a cat's
        natural aversion to water"; "offering to help was as
        instinctive as breathing" [syn: {instinctive}]
     7: (used especially of commodities) in the natural unprocessed
        condition; "natural yogurt"; "natural produce"; "raw
        wool"; "raw sugar"; "bales of rude cotton" [syn: {raw(a)},
         {rude(a)}]
     8: related by blood; not adopted; "natural parent"
     9: being talented through inherited qualities; "a natural
        leader"; "a born musician"; "an innate talent" [syn: {born(p)},
         {innate(p)}]
     10: unaffected and natural looking; "a lifelike pose"; "a
         natural reaction" [syn: {lifelike}]

natural
     n 1: someone regarded as certain to succeed; "he's a natural for
          the job"
     2: a notation cancelling a previous sharp or flat [syn: {cancel}]
     3: (craps) a first roll of 7 or 11 that immediately wins the
        stake

Source : Free On-Line Dictionary of Computing

NATURAL
     
        An integrated {4GL} from {Software AG}, Germany.  The
        menu-driven version is SUPER/NATURAL.
     
        Natural 2 is a major upgrade to Natural 1.
     
        Version 2.1.7 in the MVS environment (June 1995, also
        available for Unix).
     
        Natural works with {DB2} and various other {databases}, but
        Natural and {Adabas} normally go together.  There are many
        products available in the "Natural" family, including
        SuperNatural, Natural for Windows, Entire Connection (enables
        up/downloading and interaction with {Excel}) and Esperant.
     
        (1995-11-14)