derivation

名词 derivation:

1. the source or origin from which something derives (i.e. comes or issues)
2. (historical linguistics) an explanation of the historical origins of a word or phrase
   同义词：deriving, etymologizing
3. a line of reasoning that shows how a conclusion follows logically from accepted propositions
4. (descriptive linguistics) the process whereby new words are formed from existing words or bases by affixation: `singer' from `sing'; `undo' from `do'
5. inherited properties shared with others of your bloodline
   同义词：ancestry, lineage, filiation
6. drawing of fluid or inflammation away from a diseased part of the body
7. drawing off water from its main channel as for irrigation
8. the act of deriving something or obtaining something from a source or origin

1. Taxpayer: what do you mean by the method of derivation?
   纳税人：什么是以支出换算收入？
2. Place of origin; derivation.
   起源起源的地方; 出处
3. A line of descent; derivation.
   血缘鉴定血统的联系; 来历

der.i.va.tion

n.Abbr. der.,deriv.（名词）缩写 der.,deriv.
The act or process of deriving.
推导：推导的行为或过程
The state or fact of being derived; originating:
导出：被推导的状态或事实；源自：
例句：
a custom of recent derivation.
近来才形成的风俗

Something derived; a derivative.
派生：派生物；导出物
The form or source from which something is derived; an origin.
起源：导出某物的形式或源泉；开端
The historical origin and development of a word; an etymology.
词源：一个词的历史起源及演变；（某字的）语源
Linguistics
【语言学】
The process by which words are formed from existing words or bases by adding affixes, assinger from sing or undo from do, by changing the shape of the word or base, as song from sing, or by adding an affix and changing the pronunciation of the word or base, as electricity from electric.
衍生：通过在已存在的词或词根后加上词缀，例如从sing（唱歌） 到 singer（歌唱家） 或从 do（做） 到 undo（解开，不做） ，或通过改变词或词根的形状，例如从 sing（唱歌） 到 song（歌曲） ，或是通过加一词缀并变化该词或词根的发音，例如从 electric（电子） 到 electricity（电，电力）
A linguistic description of the process of word formation.
衍生学：构词过程的语学描述
Logic Mathematics A logical or mathematical process indicating through a sequence of statements that a result such as a theorem or a formula necessarily follows from the initial assumptions.
【逻辑学】 【数学】 推导：逻辑推理和数学演算过程，表明定理或公式是最初假设的必然结论

【引伸】
der.iva.tional
adj.（形容词）