Definition, synonyms and related words
plural of extension
"The office manager asked if we could get extensions installed at our new satellite locations to keep the phone lines working smoothly."
In plain English: Extensions are extra parts added to something to make it longer or more useful.
"The office building has several new wings added as extensions to the original structure."
Usage: Use extensions to refer to things added to an existing object or system, such as phone lines, cables, or building wings. Do not use this word when you simply mean the act of extending something or a duration of time.
Derived from the Latin extensio, this term originates from the verb extendere meaning to stretch out or spread wide. It entered English via Old French as an extension of the noun stem referring to something that is stretched or added on.