Pronunciation: [ɛkstˈɛnʃən] (IPA) 
The correct spelling of the word that refers to adding length or time to something is "extension" /ɪkˈstɛnʃən/. The "e" comes before the "x" because it is pronounced as "eks." Then, the "t" follows because the "x" and "t" sounds are similar when spoken. Finally, the "ion" ending indicates that it is a noun. So, it is important to remember that "extention" with only one "t" is a misspelling and should be avoided.
Extension is a term that has multiple meanings and can be used in various contexts. In its most fundamental sense, extension refers to the act of lengthening, broadening, or expanding something. It implies the process or action of making something larger, either in physical size, scope, duration, or influence.
In the realm of technology and computing, extension commonly refers to a file type that is appended to the end of a filename, indicating the format and nature of the associated data. For example, a file with the extension ".docx" is typically recognized as a Microsoft Word document. Extensions play a crucial role in determining the appropriate application to open a particular file.
In the context of time, extension signifies the prolongation or stretching of a specified period beyond its original endpoint. This can occur in various situations, such as extending the deadline for a project, extending a visa or permit, or extending the hours of operation for a business.
Furthermore, extension can also refer to additional or supplementary components that are added to an existing structure or system, thereby enhancing its capabilities, functionality, or reach. For instance, an extension cord is a flexible electrical cable that extends the range of a power source.
Overall, extension encompasses the concepts of enlargement, continuation, and augmentation in diverse contexts, including size, time, technology, and enhancement, among others.
The word "extension" comes from the Latin word "extendere", which is a combination of "ex" (meaning "out") and "tendere" (meaning "to stretch"). In Old French, it was further modified to "extension", which eventually evolved into the modern English term "extension". The etymology of "extension" reflects its meaning, as it refers to the act of stretching out or prolonging something in space or time.
