extensions

IPA/ɪkˈsten.ʃən/
KK[ɪkstˈɛnʃənz]IPA/ɪkˈsten.ʃən/

extensions — noun

  • extensionssingular
  • extensionsesplural

1. the act or process of making something last longer, reach further, or cover more

1.名詞B2
釋義

the act or process of making something last longer, reach further, or cover more territory — such as stretching payment over an extra month, adding a lane to a highway, or rolling out a service to new cities.

例句

The extension of the highway will connect the two towns by next year.

extension of [noun] — making something longer physically

Talia's research grant paid for the extension of her study by six months.

同義詞
  • expansion

    focuses on increasing in size or volume; extension emphasizes length or duration

  • enlargement

    suggests making bigger in all dimensions, not just longer

  • broadening

    emphasizes widening the range or scope of something

反義詞
  • contraction

    the process of becoming smaller or shorter

  • reduction

    making something smaller in size, amount, or degree

文法句型

the extension of [something]

[verb] + the extension of [something]

用法筆記

Often used with the preposition 'of' to specify what is being extended: extension of a road, extension of a deadline, extension of power.

常見錯誤

❌The road's extension was approved.
✅The extension of the road was approved.
💡'extension' typically takes 'of' after it, not a possessive form.

2. a secondary telephone that operates on the same line as the main phone, or any o

2.名詞B2
釋義

a secondary telephone that operates on the same line as the main phone, or any of several handsets linked through a central switchboard inside a workplace, hotel, or similar building.

例句

Walid answered the extension in the kitchen while his mother was on the main line.

extension — phone on the same line in another room

Every desk on the third floor has its own extension linked to the office switchboard.

同義詞
  • line

    general term for a telephone connection; extension is more specific

  • handset

    refers to the physical device, not the connection

文法句型

[number] extension

extension [number]

用法筆記

Often appears with a number: extension 201, extension 453. People commonly say 'call my extension' or 'dial extension 5.'

常見錯誤

❌Please call me on extension of 305.
✅Please call me on extension 305.
💡no 'of' is needed before the number.

3. the short code of letters appearing after a period in a filename that identifies

3.名詞A2
釋義

the short code of letters appearing after a period in a filename that identifies the kind of content it holds — such as .pdf for documents, .jpg for pictures, or .mp3 for music.

例句

Pim saved the photo as a JPEG file with a .jpg extension.

file extension — .jpg / .pdf / .doc

Nia's laptop would not open the .exe file because that extension was unsupported.

同義詞
  • file suffix

    less common term for the same concept; more technical

文法句型

[file format] extension

the .[letters] extension

用法筆記

The extension is the part after the dot only — not the whole file name. For example, in 'report.pdf', the extension is '.pdf' (or just 'pdf').

常見錯誤

❌Change the name extension to .doc.
✅Change the file extension to .doc.
💡it is called a 'file extension', not a 'name extension'.

4. additional strands fastened onto a person's existing hair or eyelashes to make t

4.名詞B1
釋義

additional strands fastened onto a person's existing hair or eyelashes to make them look longer or thicker; these can be made from either real human hair or artificial materials.

例句

Meera went to the salon to have clip-in extensions added to her short hair.

hair extensions — attached to natural hair for extra length

Felipe bought clip-in hair extensions from the salon and wore them to his cousin's wedding last Saturday.

同義詞
  • hairpiece

    a broader term that can include wigs; extensions are a specific type

  • weave

    a method where hair is sewn or glued into natural hair, one type of extension

文法句型

wear extensions

[adjective] extensions

用法筆記

Most commonly used in the plural form 'extensions' when referring to the hair attached to someone's head. Singular 'extension' is rare for this sense.

常見錯誤

❌She bought an extension for her hair.
✅She bought hair extensions.
💡this sense is almost always used in the plural.

5. a new section or room that is added to an existing building, such as a house, sc

5.名詞B1
釋義

a new section or room that is added to an existing building, such as a house, school, or office, to provide more space.

例句

The family built an extension at the back to create a larger kitchen.

extension — new room added to a house

Hamza helped his father design the extension that would become a new bedroom.

同義詞
  • addition

    more common in American English; same meaning

  • annex

    a separate building added to a main one, not attached

  • wing

    a side section of a building, often larger and more permanent

文法句型

build an extension

[room type] extension

用法筆記

Commonly used in British English for home additions. In American English, 'addition' is more frequent for this meaning.

常見錯誤

❌The extension of the house cost a lot.' (when referring to the built room)
✅The house extension cost a lot.
💡use 'house extension' (noun-noun compound) for the added structure, not 'extension of the house.'

6. a physical movement in which you straighten a part of your body, such as an arm,

6.名詞B1
釋義

a physical movement in which you straighten a part of your body, such as an arm, leg, or back, as part of exercise or to reduce muscle stiffness.

例句

Before her run, Sivan always does a few leg extensions to warm up her muscles.

leg extension — exercise that straightens the leg

The yoga teacher showed the class a proper back extension on the mat.

同義詞
  • stretch

    a more general, everyday term for any muscle-lengthening movement

  • straightening

    describes the action without being a noun; less common as a standalone term

反義詞
  • curl

    bending a joint in the opposite direction, as in a bicep curl

  • contraction

    tightening or shortening a muscle

文法句型

do [number] [body part] extensions

[body part] extension

用法筆記

Often combined with a body part name: leg extension, back extension, knee extension. This is a technical term used in fitness, yoga, and physical therapy settings.

常見錯誤

❌I did five extensions this morning.' (too vague)
✅I did five leg extensions this morning.
💡always specify which body part is being extended, or the meaning is unclear.

7. the range, scope, or degree to which something applies, reaches, or has influenc

7.名詞B2
釋義

the range, scope, or degree to which something applies, reaches, or has influence — often used in the fixed phrase by extension to show that a related point follows as a logical consequence.

例句

By extension, Sofia's decision to leave the company affected the morale of the whole department.

by extension — as a logical consequence

The extension of the flood waters across the valley was visible from the hilltop.

extension of [waters] across [area] — physical spreading

同義詞
  • degree

    focuses on intensity or level rather than physical range; 'a high degree of skill'

  • scope

    emphasises the breadth or range of activities covered; 'the scope of the investigation'

  • range

    suggests a span from one limit to another; 'a wide range of temperatures'

反義詞
  • limit

    a point at which something stops; 'the limits of human knowledge'

文法句型

the extension of [something]

by extension

用法筆記

Used in formal or literary contexts to express scope or degree. The fixed phrase 'by extension' functions as a discourse connector meaning 'as a logical consequence' or 'similarly'. Unlike sense 1 (REACH), this sense does not describe an act of expanding; it describes how far something already is.

常見錯誤

❌To the extension that she was happy.
✅To the extent that she was happy, she stayed.
💡'extension' does not replace 'extent' in the phrase 'to the extent that'; use 'to the extent that' for that structure.

8. additional time given to someone to finish a task, pay a bill, or meet a deadlin

8.名詞B1
釋義

additional time given to someone to finish a task, pay a bill, or meet a deadline.

例句

The professor gave Amira a three-day extension to finish her research paper.

give [someone] + a [time] extension + to [do something]

Indra applied for an extension on her car loan payments after she lost her job.

extension on [loan/payment/deadline]

同義詞
  • postponement

    suggests delaying the entire deadline rather than adding time to it; slightly more formal

  • grace period

    a fixed window after the deadline during which no penalty applies; 'a 30-day grace period for payment'

  • delay

    neutral word for when something happens later than planned; less specific than 'extension'

反義詞
  • deadline

    the fixed time by which something must be done

文法句型

give/grant/request/ask for + an extension

extension + on [something]

用法筆記

Commonly used with verbs like 'give,' 'grant,' 'request,' 'ask for,' and 'apply for.' In academic contexts it typically refers to extra time for assignments; in financial contexts it refers to extra time for payments.

常見錯誤

❌I need a time extension' (redundant).
✅I need an extension on the deadline.
💡'extension' already implies extra time; use 'on' or 'for' to specify what.

9. a set of classes organised by a college or university for members of the public

9.名詞B2
釋義

a set of classes organised by a college or university for members of the public who are not studying towards a degree there, often available in the evenings or online.

例句

Mei took a business management course through the university extension program.

through + the extension program

The extension school offers evening classes in web design and computer programming.

extension school + offers + [subject] classes

同義詞
  • continuing education

    broader term covering all adult learning after formal schooling; more widely understood

  • adult education

    focuses on learners who are adults, not necessarily university-affiliated

  • extramural studies

    British term for courses taken outside a university's main degree structure

文法句型

extension + [program/course/school/class]

through + the extension + [department/school/program]

用法筆記

Attributive use ('extension course,' 'extension school') is more common than standalone use. In British English, 'extramural' or 'continuing education' is often preferred over 'extension.'

常見錯誤

❌I study at the extension' (incomplete).
✅I take courses through the extension school.
💡'extension' alone is ambiguous; pair it with 'course,' 'program,' or 'school.'

extensions — adjective