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extension

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extension/ɪkˈstɛnʃən/noun
pluralextensions
extension
/ɪkˈstɛnʃən/
noun
pluralextensions
Learner's definition of EXTENSION  
: the act of extending something: such as
: the act of making something longer or greater
[noncount]
[count]
   b  : the act of straightening or stretching something (such as an arm or a leg)
[count]
[noncount]
[count]  : extra time allowed for doing something
[count]  : something (such as an interest or activity) that develops from something else
◊ The phrase by extension is used to say that what follows comes from or is connected with something that has already been mentioned.
— + of
[count] 
: a part that is added on to something to make it larger or longer
   b  : extension cord
[count]  : an extra telephone that is connected to the main line
also  : a telephone number that connects to a particular extension
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