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

 

fractionally

 adverb
adverb
BrE BrE//ˈfrækʃənəli//
 
; NAmE NAmE//ˈfrækʃənəli//
 
 
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to a very small degree He was just fractionally ahead at the finishing line.
See the Oxford Advanced American Dictionary entry: fractionally