名詞 extension:

1. a mutually agreed delay in the date set for the completion of a job or payment of a debt
2. act of expanding in scope; making more widely available
3. the spreading of something (a belief or practice) into new regions
   同義詞：propagation
4. an educational opportunity provided by colleges and universities to people who not enrolled as regular students
   同義詞：extension service, university extension
5. act of stretching or straightening out a flexed limb
6. a string of characters beginning with a period and followed by one to three letters; the optional second part of a PC computer filename
   同義詞：filename extension, file name extension
7. the most direct or specific meaning of a word or expression; the class of objects that an expression refers to
   同義詞：reference, denotation
8. the ability to raise the working leg high in the air
9. amount or degree or range to which something extends
   同義詞：lengthiness, prolongation
10. an additional telephone set that is connected to the same telephone line
    同義詞：telephone extension, extension phone
11. an addition to the length of something
    同義詞：elongation
12. an addition that extends a main building
    同義詞：annex, annexe, wing

1. There are telephone extensions in every office.
   每間辦公室都有電話分機(jī)。
2. She has an extension in the kitchen and in the bedroom.
   她的廚房和臥室都有電話分機(jī)。
3. He asked for an extension of his visa.
   他申請(qǐng)延長(zhǎng)簽證有效期。
4. He built an extension onto his house.
   他給自己的住宅擴(kuò)建了一部分。

ex.ten.sion

n.Abbr. ext.（名詞）縮寫 ext.
The act of extending or the condition of being extended.
伸展：伸展的行為或被伸長(zhǎng)的狀況
The amount, degree, or range to which something extends or can extend:
擴(kuò)大，伸長(zhǎng)：擴(kuò)大或能擴(kuò)大的數(shù)量、程度或范圍：
例句：
The wire has an extension of 50 feet.
電線可伸長(zhǎng)到50英尺

The act of straightening or extending a limb.
伸直：伸直或伸展肢體的行為
The position assumed by an extended limb.
伸肢定位：用伸出的肢體判斷出的位置
Medicine The application of traction to a fractured or dislocated limb to restore the normal position.
【醫(yī)學(xué)】 牽引，牽伸（術(shù)）：為使骨折或脫位的肢體恢復(fù)原位而進(jìn)行的牽伸動(dòng)作

An addition that increases the area, influence, operation, or contents of something:
擴(kuò)大，增加：面積的增加、影響的擴(kuò)大、功能的增強(qiáng)或某物內(nèi)容的增多：
例句：
an extension for the vacuum cleaner; built a new extension onto the hospital wing.
真空吸塵器容量加大；向醫(yī)院的一側(cè)擴(kuò)建

An additional telephone connected to a main line.
電話分機(jī)：一部連到主線上的增設(shè)電話

An allowance of extra time, especially for the repayment of a debt.
寬限：額外增加的時(shí)間，尤其為了還債
The period of this extra time:
寬限期：額外延長(zhǎng)的期限：
例句：
three months` extension on the loan.
貨款的三個(gè)月寬限期

The property of an object by which it occupies space.
財(cái)物：占據(jù)空間的物體的財(cái)產(chǎn)
A program in a university, college, or school that offers instruction, as by television or correspondence, to persons unable to attend at the usual time or in the usual place.
函授：在大學(xué)、學(xué)院或?qū)W校開(kāi)設(shè)的一種課程，如通過(guò)電視或通信對(duì)那些不能在通常時(shí)間或在通常地點(diǎn)上課的人提供教育
Logic The class of objects designated by a specific term or concept; denotation.
【邏輯學(xué)】 外延，概說(shuō)：用特定的詞或概念來(lái)標(biāo)明的學(xué)科種類；外延
Mathematics A set that includes a given and similar set as a subset.
【數(shù)學(xué)】 子集：包含一個(gè)給定的或相似的子集的集合
n.attributive.（定語(yǔ)名詞）
Often used to modify another noun:
常用于修飾另一個(gè)名詞：
例句：
an extension ladder; an extension cord.
伸縮梯；延長(zhǎng)線

來(lái)源：
Middle English extensioun
中古英語(yǔ) extensioun
from Old French extension
源自 古法語(yǔ) extension
from Latin extônsiô extônsiôn-
源自 拉丁語(yǔ) extônsiô extônsiôn-
from extônsus [past participle of] extendere [to extend] * see extend
源自 extônsus [] extendere的過(guò)去分詞 [伸展] *參見(jiàn) extend

【引伸】
exten.sional
adj.（形容詞）