Definition of extendable adjective from the Oxford Advanced Learner's Dictionary

 

extendable

 adjective
(also extendible)adjective
BrE BrE//ɪkˈstendəbl//
 
; NAmE NAmE//ɪkˈstendəbl//
 
 
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that can be made longer, or made valid for a longer time an extendable ladder The visa is for 14 days, extendable to one month.
See the Oxford Advanced American Dictionary entry: extendable