Extention or extension
Did you mean “extension”?
INCORRECT
Extention
CORRECT
Extension
Extension
Noun
Definition:
A part that is added to something to enlarge or prolong it
Examples:
- The railway's southern extension
Synonyms:
- Addition
- Add-on
- Adjunct
- Addendum
FAQ's
Is it extention or extension? 
The correct word is extension
How to pronounce extension? 
What does extension mean?
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