extension
UK: ɪkˈstenʃn̩ | US: ɪkˈstenʃn̩
n. the act of extending or the state of being extended
n. a part that is added to something to enlarge or prolong it
n. the range or scope of something
The word "extension" derives from the Latin extendere ("to stretch out"), composed of ex- ("out") + tendere ("to stretch"). The morpheme exten preserves the core idea of stretching, while -sion (a noun-forming suffix) indicates the result or action of stretching. Over time, the term evolved from physical stretching to metaphorical expansions, such as prolonging time or enlarging scope.
The extension of the deadline relieved the students.
She added an extension to her house for extra space.
The teacher discussed the extension of the theory to new fields.
The file extension indicates its format (e.g., .pdf).
His arm’s extension reached the top shelf effortlessly.