名詞 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
   同義詞：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
   同義詞：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?
   納稅人：什么是以支出換算收入？
2. Place of origin; derivation.
   起源起源的地方; 出處
3. A line of descent; derivation.
   血緣鑒定血統(tǒng)的聯(lián)系; 來歷

der.i.va.tion

n.Abbr. der.,deriv.（名詞）縮寫 der.,deriv.
The act or process of deriving.
推導：推導的行為或過程
The state or fact of being derived; originating:
導出：被推導的狀態(tài)或事實；源自：
例句：
a custom of recent derivation.
近來才形成的風俗

Something derived; a derivative.
派生：派生物；導出物
The form or source from which something is derived; an origin.
起源：導出某物的形式或源泉；開端
The historical origin and development of a word; an etymology.
詞源：一個詞的歷史起源及演變；（某字的）語源
Linguistics
【語言學】
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：通過在已存在的詞或詞根后加上詞綴，例如從sing（唱歌） 到 singer（歌唱家） 或從 do（做） 到 undo（解開，不做） ，或通過改變詞或詞根的形狀，例如從 sing（唱歌） 到 song（歌曲） ，或是通過加一詞綴并變化該詞或詞根的發(fā)音，例如從 electric（電子） 到 electricity（電，電力）
A linguistic description of the process of word formation.
衍生學：構(gòu)詞過程的語學描述
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.
【邏輯學】 【數(shù)學】 推導：邏輯推理和數(shù)學演算過程，表明定理或公式是最初假設的必然結(jié)論

【引伸】
der.iva.tional
adj.（形容詞）