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 Derivation \Der`i*va"tion\, n. [L. derivatio: cf. F.
   d['e]rivation. See {Derive}.]
   1. A leading or drawing off of water from a stream or source.
      [Obs.] --T. Burnet.
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   2. The act of receiving anything from a source; the act of
      procuring an effect from a cause, means, or condition, as
      profits from capital, conclusions or opinions from
      evidence.
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            As touching traditional communication, . . . I do
            not doubt but many of those truths have had the help
            of that derivation.                   --Sir M. Hale.
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   3. The act of tracing origin or descent, as in grammar or
      genealogy; as, the derivation of a word from an Aryan
      root.
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   4. The state or method of being derived; the relation of
      origin when established or asserted.
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   5. That from which a thing is derived.
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   6. That which is derived; a derivative; a deduction.
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            From the Euphrates into an artificial derivation of
            that river.                           --Gibbon.
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   7. (Math.) The operation of deducing one function from
      another according to some fixed law, called the law of
      derivation, as the operation of differentiation or of
      integration.
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   8. (Med.) A drawing of humors or fluids from one part of the
      body to another, to relieve or lessen a morbid process.
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   9. The formation of a word from its more original or radical
      elements; also, a statement of the origin and history of a
      word.
      [Webster 1913 Suppl.]