Definition of lacuna noun from the Oxford Advanced American Dictionary

 

lacuna

 noun
noun
NAmE//ləˈkunə//
 
, NAmE//ləˈkyunə//
 
(pl. lacunae
NAmE//ləˈkuni//
 
, NAmE//ləˈkyuni//
 
, (or )lacunas)
(formal)
 
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a place where something is missing in a piece of writing or in an idea, a theory, etc. synonym gap
See the Oxford Advanced Learner's Dictionary entry: lacuna