Definition of lacuna
1
: a blank space or a missing part : gap
the evident lacunae in his story— Shirley Hazzard
also
: deficiency sense 1
despite all these lacunae, those reforms were a vast improvement — New Republic
2
: a small cavity, pit, or discontinuity in an anatomical structure
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Merriam-Webster unabridged
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Time Traveler for lacuna
The first known use of lacuna was in 1652
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