1. A leading or drawing off of water from a stream or source.

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. "As touching traditional communication, . . . I do not doubt but many of those truths have had the help of that derivation." (Sir M. Hale)

3. The act of tracing origin or descent, as in grammar or genealogy; as, the derivation of a word from an Aryan root.

4. The state or method of being derived; the relation of origin when established or asserted.

5. That from which a thing is derived.

6. That which is derived; a derivative; a deduction. "From the Euphrates into an artificial derivation of that river." (Gibbon)

7. <mathematics> The operation of deducing one function from another according to some fixed law, called the law of derivation, as the of differentiation or of integration.

8. <medicine> A drawing of humors or fluids from one part of the body to another, to relieve or lessen a morbid process.

Origin: L. Derivatio: cf. F. Derivation. See Derive.

(01 Mar 1998)

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