derivation
[`dɛrə'veʃən]
n. 推论, 推,

[医] 衍, 诱

1. A line of descent; derivation.
   血缘鉴血统系；
2. Place of origin; derivation.
   起源起源；
3. Taxpayer: what do you mean by the method of derivation?
   纳税：什算？

derivation
[ noun ]

1. the source or origin from which something derives (i.e. comes or issues)

<noun.location>
he prefers shoes of Italian derivation
music of Turkish derivation

2. (historical linguistics) an explanation of the historical origins of a word or phrase

<noun.communication>

3. a line of reasoning that shows how a conclusion follows logically from accepted propositions

<noun.cognition>

4. (descriptive linguistics) the process whereby new words are formed from existing words or bases by affixation

<noun.process>
`singer' from `sing' or `undo' from `do' are examples of derivations

5. inherited properties shared with others of your bloodline

<noun.attribute>

6. drawing of fluid or inflammation away from a diseased part of the body

<noun.act>

7. drawing off water from its main channel as for irrigation

<noun.act>

8. the act of deriving something or obtaining something from a source or origin

<noun.act>

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.

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. (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.

8. (Med.) A drawing of humors or fluids from one part of the
body to another, to relieve or lessen a morbid process.

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.]