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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Time Traveler for lacuna
The first known use of lacuna was in 1652
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