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The Collaborative International Dictionary of English v.0.48 (gcide)

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.]