Definition of notionally adverb from the Oxford Advanced Learner's Dictionary

 

notionally

 adverb
adverb
BrE BrE//ˈnəʊʃənəli//
 
; NAmE NAmE//ˈnoʊʃənəli//
 
(formal)
 
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in a way that does not exist in reality but only as an idea or theory This tax cut is notionally for one year, but reversing it would be difficult.