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

 

fleetingly

 adverb
adverb
BrE BrE//ˈfliːtɪŋli//
 
; NAmE NAmE//ˈfliːtɪŋli//
 
 
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for only a short time synonym briefly She smiled fleetingly. How could she, even fleetingly, entertain such a thought?