Definition: integral

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Source: WordNet (r) 1.7 

integral
     adj 1: existing as an essential constituent or characteristic; "the
            Ptolemaic system with its built-in concept of
            periodicity"; "a constitutional inability to tell the
            truth" [syn: built-in, constitutional, inbuilt,
            inherent]
     2: constituting the undiminished entirety; lacking nothing
        essential especially not damaged; "a local motion keepeth
        bodies integral"- Bacon; "was able to keep the collection
        entire during his lifetime"; "fought to keep the union
        intact" [syn: entire, intact]
     n : the result of a mathematical integration; F(x) is the
         integral of f(x) if dF/dx = f(x)

Source: Webster's Revised Unabridged Dictionary (1913) 

Integral \In"te*gral\, a. [Cf. F. int['e]gral. See Integer.]
   1. Lacking nothing of completeness; complete; perfect;
      uninjured; whole; entire.

            A local motion keepeth bodies integral. --Bacon.

   2. Essential to completeness; constituent, as a part;
      pertaining to, or serving to form, an integer; integrant.

            Ceasing to do evil, and doing good, are the two
            great integral parts that complete this duty.
                                                  --South.

   3. (Math.)
      (a) Of, pertaining to, or being, a whole number or
          undivided quantity; not fractional.
      (b) Pertaining to, or proceeding by, integration; as, the
          integral calculus.

   Integral calculus. See under Calculus.
Integral \In"te*gral\, n.
   1. A whole; an entire thing; a whole number; an individual.

   2. (Math.) An expression which, being differentiated, will
      produce a given differential. See differential
      Differential, and Integration. Cf. Fluent.

   Elliptic integral, one of an important class of integrals,
      occurring in the higher mathematics; -- so called because
      one of the integrals expresses the length of an arc of an
      ellipse.
Fluent \Flu"ent\, n.
   1. A current of water; a stream. [Obs.]

   2. [Cf. F. fluente.] (Math.) A variable quantity, considered
      as increasing or diminishing; -- called, in the modern
      calculus, the function or integral.