Definition of lacuna noun from the Oxford Advanced Learner's Dictionary

 

lacuna

 noun
noun
BrE BrE//ləˈkjuːnə//
 
; NAmE NAmE//ləˈkjuːnə//
 
, also NAmE//ˈkuː//
 
(pl. lacunae
BrE BrE//ləˈkjuːniː//
 
; NAmE NAmE//ləˈkjuːniː//
 
, NAmE//ləˈkuːniː//
 
, 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 Word Origin mid 17th cent.: from Latin, ‘pool’, from lacus ‘lake’.
See the Oxford Advanced American Dictionary entry: lacuna