extension

名词 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
   同义词：propagation
4. an educational opportunity provided by colleges and universities to people who not enrolled as regular students
   同义词：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
   同义词：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
   同义词：reference, denotation
8. the ability to raise the working leg high in the air
9. amount or degree or range to which something extends
   同义词：lengthiness, prolongation
10. an additional telephone set that is connected to the same telephone line
    同义词：telephone extension, extension phone
11. an addition to the length of something
    同义词：elongation
12. an addition that extends a main building
    同义词：annex, annexe, wing

1. There are telephone extensions in every office.
   每间办公室都有电话分机。
2. She has an extension in the kitchen and in the bedroom.
   她的厨房和卧室都有电话分机。
3. He asked for an extension of his visa.
   他申请延长签证有效期。
4. He built an extension onto his house.
   他给自己的住宅扩建了一部分。

ex.ten.sion

n.Abbr. ext.（名词）缩写 ext.
The act of extending or the condition of being extended.
伸展：伸展的行为或被伸长的状况
The amount, degree, or range to which something extends or can extend:
扩大，伸长：扩大或能扩大的数量、程度或范围：
例句：
The wire has an extension of 50 feet.
电线可伸长到50英尺

The act of straightening or extending a limb.
伸直：伸直或伸展肢体的行为
The position assumed by an extended limb.
伸肢定位：用伸出的肢体判断出的位置
Medicine The application of traction to a fractured or dislocated limb to restore the normal position.
【医学】 牵引，牵伸（术）：为使骨折或脱位的肢体恢复原位而进行的牵伸动作

An addition that increases the area, influence, operation, or contents of something:
扩大，增加：面积的增加、影响的扩大、功能的增强或某物内容的增多：
例句：
an extension for the vacuum cleaner; built a new extension onto the hospital wing.
真空吸尘器容量加大；向医院的一侧扩建

An additional telephone connected to a main line.
电话分机：一部连到主线上的增设电话

An allowance of extra time, especially for the repayment of a debt.
宽限：额外增加的时间，尤其为了还债
The period of this extra time:
宽限期：额外延长的期限：
例句：
three months` extension on the loan.
货款的三个月宽限期

The property of an object by which it occupies space.
财物：占据空间的物体的财产
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：在大学、学院或学校开设的一种课程，如通过电视或通信对那些不能在通常时间或在通常地点上课的人提供教育
Logic The class of objects designated by a specific term or concept; denotation.
【逻辑学】 外延，概说：用特定的词或概念来标明的学科种类；外延
Mathematics A set that includes a given and similar set as a subset.
【数学】 子集：包含一个给定的或相似的子集的集合
n.attributive.（定语名词）
Often used to modify another noun:
常用于修饰另一个名词：
例句：
an extension ladder; an extension cord.
伸缩梯；延长线

来源：
Middle English extensioun
中古英语 extensioun
from Old French extension
源自 古法语 extension
from Latin extônsiô extônsiôn-
源自 拉丁语 extônsiô extônsiôn-
from extônsus [past participle of] extendere [to extend] * see extend
源自 extônsus [] extendere的过去分词 [伸展] *参见 extend

【引伸】
exten.sional
adj.（形容词）