Difference Wiki

Extention vs. Extension: Mastering the Correct Spelling

Edited by Aimie Carlson || By Janet White || Updated on March 12, 2024
"Extention" is an incorrect spelling. The correct spelling is "Extension," a term used to describe the act of extending or the state of being extended.

Which is correct: Extention or Extension

How to spell Extension?

Extention is Incorrect

Extension is Correct


Key Differences

Note that “tension” also uses “-sion.” Associate “Extension” with extending something in length or duration.
Associating the word with common phrases like "extension cord" can also reinforce the correct spelling.
Remember “Extension” by focusing on the root word “extend” plus the suffix “-sion.”

Correct usage of Extension

The building's extention was completed last month.
The building's extension was completed last month.
The extention cord is not long enough to reach the outlet.
The extension cord is not long enough to reach the outlet.
She asked for an extention on her project deadline.
She asked for an extension on her project deadline.
He's working on a software extention that improves user experience.
He's working on a software extension that improves user experience.
The teacher granted a homework extention to all students.
The teacher granted a homework extension to all students.

Extension Definitions

Extension refers to the act of extending or the state of being extended.
The manager granted a one-week extension to complete the project.
The act of extending or the condition of being extended
The extension of the subway into the suburbs.
The amount, degree, or range to which something extends or can extend
The wire has an extension of 50 feet.
The act of straightening or extending a limb.
The position assumed by an extended limb.
A length of human or synthetic hair attached to the scalp or to strands of hair close to the scalp to add volume, length, or color.
(Medicine) The application of traction to a fractured or dislocated limb to restore the normal position.
An addition that increases the area, influence, operation, or contents of something
An extension for the vacuum cleaner.
Built a new extension onto the hospital wing.
An additional telephone connected to a main line.
An allowance of extra time, as for the repayment of a debt.
The period of this extra time
Three months' extension on the loan.
The property of an object by which it occupies space.
A program in a university, college, or school offering academic instruction to nontraditional students, such as working adults, who cannot attend classes at the usual place and time.
A publicly funded program offering such instruction along with information on agriculture, home economics, and business.
(Computers) A set of characters that follow a filename and are separated from it by a period, used to identify the kind of file
In most operating systems, filenames having the extension .EXE are executable files.
(Logic) The class of objects designated by a specific term or concept; denotation.
(Mathematics) A set that includes a given and similar set as a subset.
The act of extending; a stretching out; enlargement in length, breadth, or time; an increase
Next month the house is undergoing an extension.
Due to the unforeseen circumstances, you are allowed an extension of two weeks to complete the task.
The state of being extended
That property of a body by which it occupies a portion of space (or time, e.g. "spatiotemporal extension")
A part of a building that has been extended from the original
(semantics) Capacity of a concept or general term to include a greater or smaller number of objects; — correlative of intension.
Semantic widening, broadening of meaning
A written engagement on the part of a creditor, allowing a debtor further time to pay a debt.
(medicine) The operation of stretching a broken bone so as to bring the fragments into the same straight line.
(weightlifting) An exercise in which an arm or leg is straightened against resistance.
(fencing) A simple offensive action, consisting of extending the weapon arm forward.
(telecommunication) A numerical code used to specify a specific telephone in a telecommunication network.
(computing) A file extension.
Files with the .txt extension usually contain text.
(computing) An optional software component that adds functionality to an application.
A browser extension
(logic) The set of tuples of values that, used as arguments, satisfy the predicate.
(grammar) A kind of derivative morpheme applied to verbs in Bantu languages.
(education) University programs that are targeted at the broader (usually adults) community whose participants are not full-time enrolled students.
The act of extending or the state of being extended; a stretching out; enlargement in breadth or continuation of length; increase; augmentation; expansion.
That property of a body by which it occupies a portion of space.
Capacity of a concept or general term to include a greater or smaller number of objects; - correlative of intension.
The law is that the intension of our knowledge is in the inverse ratio of its extension.
The extension of [the term] plant is greater than that of geranium, because it includes more objects.
The operation of stretching a broken bone so as to bring the fragments into the same straight line.
The straightening of a limb, in distinction from flexion.
A mutually agreed delay in the date set for the completion of a job or payment of a debt;
They applied for an extension of the loan
Act of expanding in scope; making more widely available;
Extension of the program to all in need
The spreading of something (a belief or practice) into new regions
An educational opportunity provided by colleges and universities to people who not enrolled as regular students
Act of stretching or straightening out a flexed limb
A string of characters beginning with a period and followed by one to three letters; the optional second part of a PC computer filename;
Most applications provide extensions for the files they create
Most BASIC files use the filename extension .BAS
The most direct or specific meaning of a word or expression; the class of objects that an expression refers to;
The extension of `satellite of Mars' is the set containing only Demos and Phobos
The ability to raise the working leg high in the air;
The dancer was praised for her uncanny extension
Good extension comes from a combination of training and native ability
Amount or degree or range to which something extends;
The wire has an extension of 50 feet
An additional telephone set that is connected to the same telephone line
An addition to the length of something
An addition that extends a main building
It can denote a part that is added to something to enlarge or prolong it.
We added an extension to the building to create more office space.
Extension also means a length of electrical cord that allows an appliance to be connected to a power source.
We needed an extension cord to reach the outlet.
It represents a set of characters added to a file name to define the file type.
The file has a .jpg extension.
In terms of telephone systems, it refers to a subsidiary telephone line connected to the main line.
Please dial extension 1234 to reach the helpdesk.

Extension Sentences

Can you pass me the extension cord from the drawer?
The deadline extension helped me complete my essay without rushing.
They are planning an extension to the family home to create more space.
The new wing is an extension of the main hospital building.
The professor's office hours extension allows more students to get help.
We filed for an extension on our taxes because we needed more time.
The architect designed a seamless extension for the old museum.
The university offers an extension program for adult learners.
Due to popular demand, the exhibition's run has been given an extension.
She applied for an extension of her visa to stay longer.
The government announced an extension of the subsidy for renewable energy.
The browser extension blocks annoying ads on websites.
The garden extension includes a new vegetable patch and a greenhouse.
The company is working on an extension of its product line.
The kitchen extension has brought so much more light into the house.
For her project, she received an extension from her supervisor.
With the road extension, commuting time will be cut in half.
The new software extension enhances the program's functionality.
The warranty extension gives customers an additional year of coverage.
The cable extension will allow us to set up the TV in the corner.
The library's extension offers new study rooms and a café.
The team is excited about the project's scope extension.
The extension ladder reaches up to 20 feet, perfect for the job.
The contract extension secures his position for another three years.

Extension Idioms & Phrases

Extension cord

A length of electrical cable with a plug on one end and one or more sockets on the other, used to bring power to a device or to multiple devices.
We needed an extension cord to connect the projector to the nearest outlet.

Deadline extension

An extension of the time by which something must be completed.
Due to the server issues, everyone received a deadline extension for the online assignment.

Give someone an extension

To allow more time for something to be completed.
The professor will give us an extension if we explain our situation.

Software extension

A piece of software that adds new features or functionality to an existing program.
The photo editing software works much better with the new software extension.

Extension ladder

A type of ladder that can be extended to reach higher places.
He used an extension ladder to clean the gutters on the house.

Building extension

An additional structure built to increase the size of an existing building.
Their house looks completely different after they added that modern building extension.

Extension course

A class or series of classes offered to people who are not full-time students of a school or university.
She's taking an extension course in graphic design to improve her skills.


Why is it called Extension?

It is called "Extension" because it represents the act of extending or being extended in length, area, influence, or duration.

Which vowel is used before Extension?

The vowel “an” as in "an extension."

What is the root word of Extension?

The root word is "extend."

Which preposition is used with Extension?

"Of" is often used with Extension, as in "extension of."

Is Extension a negative or positive word?

Extension is a neutral word; it can be positive or negative depending on the context.

What is the pronunciation of Extension?

Extension is pronounced as /ɪkˈstɛnʃən/.

Is Extension an adverb?

No, Extension is not an adverb.

What is the verb form of Extension?

The verb form is "extend."

Is Extension a noun or adjective?

Extension is a noun.

Is Extension a countable noun?

Yes, Extension is a countable noun.

What is the singular form of Extension?

The singular form is "extension."

What is the plural form of Extension?

The plural form is "extensions."

Which conjunction is used with Extension?

There is no specific conjunction exclusively used with Extension.

Is Extension a vowel or consonant?

Extension is a word consisting of both vowels and consonants.

Is Extension a collective noun?

No, Extension is not a collective noun.

Is the Extension term a metaphor?

It can be used metaphorically to describe something being extended in a non-physical way, like extending kindness.

What part of speech is Extension?

Extension is a noun.

What is another term for Extension?

Another term for extension can be "elongation."

Which determiner is used with Extension?

The determiner “an” or “the” can be used with Extension.

What is the third form of Extension?

There is no third form of Extension.

Which article is used with Extension?

The article "an" is used with Extension, as in "an extension."

Is Extension an abstract noun?

It can be, depending on its usage, especially when representing a concept or state of being extended.

How many syllables are in Extension?

Extension has three syllables.

How do we divide Extension into syllables?

Extension is divided as ex-ten-sion.

What is the opposite of Extension?

The opposite of extension could be "contraction" or "reduction."

What is the first form of Extension?

The first form is "extension."

What is the second form of Extension?

There is no second form of Extension.

How is Extension used in a sentence?

Extension is used as a noun, e.g., "He requested an extension on his assignment due date."

Is the word Extension imperative?

No, the word Extension is not imperative.

What is a stressed syllable in Extension?

The second syllable "ten" is stressed in Extension.
About Author
Written by
Janet White
Janet White has been an esteemed writer and blogger for Difference Wiki. Holding a Master's degree in Science and Medical Journalism from the prestigious Boston University, she has consistently demonstrated her expertise and passion for her field. When she's not immersed in her work, Janet relishes her time exercising, delving into a good book, and cherishing moments with friends and family.
Edited by
Aimie Carlson
Aimie Carlson, holding a master's degree in English literature, is a fervent English language enthusiast. She lends her writing talents to Difference Wiki, a prominent website that specializes in comparisons, offering readers insightful analyses that both captivate and inform.

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