Extention vs. Extension: The Correct Spellings

"Extention" and "extension" differ by just one letter, with the correct form being "extension." The letter 's' in "extension" is consistent with its root word "extend." When words shift from verbs to nouns in English, their spelling often retains the core verb. In this case, "extension" keeps the 's' from "extend."

The word "extension" has its origins in Latin. It is derived from "extensio," from "extendere," meaning "to stretch out or extend." This history further solidifies the presence of the 's' in "extension."

A mnemonic trick to remember "extension" is to think of the word "tension" which also contains an 's'. So, when you think of something being stretched or in tension, remember the 's' in "extension."

Other forms of this word include "extensive," "extensively," and "extensiveness."

Incorrect: The teacher discussed the importance of leg extention in dance.

Correct: The teacher discussed the importance of leg extension in dance.

Incorrect: She asked for an extention on her project deadline.

Correct: She asked for an extension on her project deadline.

Incorrect: The new wing is a significant extention of the museum.

Correct: The new wing is a significant extension of the museum.

Incorrect: We need to buy a cable extention for the office equipment.

Correct: We need to buy a cable extension for the office equipment.

Incorrect: Can you measure the extention of the fabric?

Correct: Can you measure the extension of the fabric?

The amount by which something is increased.

A subsidiary line, telephone, or computer program.

The capacity to be stretched or extended.

The act of extending or the condition of being extended

The amount, degree, or range to which something extends or can extend

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 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

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

(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

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.

(computing) An optional software component that adds functionality to an application.

(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 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;

act of expanding in scope; making more widely available;

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;

the most direct or specific meaning of a word or expression; the class of objects that an expression refers to;

the ability to raise the working leg high in the air;

amount or degree or range to which something extends;

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

The act of making something longer or greater.

A part that is added to something to enlarge or prolong it.

The extension cord is too short to reach the outlet from here.

I got an extension on my essay, so I have an extra week to work on it.

They're planning an extension to the shopping mall next year.

The new extension of the bike path makes our ride much longer.

My phone's battery life is so bad I need an extension battery just to get through the day.

The company announced an extension of the deadline for the contest.

The garden's extension includes a new vegetable patch and a greenhouse.

Our teacher gave us an extension on the project because of the snow day.

She uses a hair extension to add volume and length to her hair.

Due to the extension of the school year, summer vacation will start a week later.

We're adding an extension to our house to have more room for the family.

The extension on the telescope allows us to see further into space.

The extension of the museum includes a new wing for contemporary art.

The extension of the trail leads to a beautiful overlook.

The extension of the warranty gives you an additional year of coverage.

With the browser extension, you can block unwanted ads.

After the renovation, the kitchen now has an extension that serves as a dining area.

The library's extension offers more space for reading and studying.

He built an extension onto his guitar to create unique sounds.

The software extension added new features to the program.

The extension of the subway line will make commuting much easier for many people.

To reach the top shelf, he used an extension ladder.

The extension agent visited the farm to offer advice on crop rotation.

I need an extension on my subscription to keep receiving the magazine.

The extension of the play's run means it will be in theaters until June.

The term "extension" has its origins in Latin, derived from "extensio" which comes from "extendere" meaning "to stretch out or extend."

The correct spelling is "extension".

"Extention" is wrong because the root verb is "extend," and the noun form "extension" retains the 's'.

Yes, related words include "extensive," "extensively," and "extensiveness."

Think of the word "tension," which has an 's', so when you consider something being stretched or in tension, remember the 's' in "extension."

You can say, "I'm planning to build an extension to my house next year."

While some people might use "extention" informally or by mistake, it is always recommended to use the correct spelling, "extension."

No, "extension" has a broad range of applications, from construction to telecommunications to hair accessories.

Yes, the verb form is "extend."

"Extension" can mean making something longer, a part added to enlarge something, the amount of increase, a subsidiary telephone line, or the ability to be stretched.