Plural of extention, a misspelling or archaic spelling of 'extensions'; meanings include the act of extending or something added to make something longer.
A variant spelling of 'extensions' using the older spelling 'extention' (from Latin extensio). This spelling persisted into the 17th-18th centuries before 'extension' became the standard modern form.
The word 'extention' is a common modern misspelling, but it was actually the legitimate spelling in historical documents—language standardization eventually chose 'extension,' leaving 'extention' as a ghost word.
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