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A lacuna is a place in a piece of writing where something is missing. An old letter is torn. A skipped a line. Bugs ate a corner of a page. That empty stretch is a lacuna. Scholars say it a lot: there is a lacuna in the manuscript here. The Latin word first meant a ditch, a pit, a hollow — a hole in the ground — and English kept the “hole” idea, but for text. People also stretch it: a lacuna in the law, a lacuna in what we know. Same picture: something that should be there is not. In careful writing it still sounds learned and a bit Latin. You would not use it for a missing sock.
闕文（稿子、文獻裡缺了一截）
原始詞典資料6 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
lacunanoun/ləˈk(j)uː.nə/
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anatomymedicinesciencesA small opening; a small pit or depression, especially in bone.
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anatomymedicinesciencesA small opening; a small pit or depression, especially in bone.
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A small blank space; a gap or vacancy; a hiatus.
- "Our young friend makes up for many obvious mental lacunæ by some measure of primitive common sense," remarked Challenger.
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A small blank space; a gap or vacancy; a hiatus.
- Long lacunae in this inscription make interpretation difficult.
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A small blank space; a gap or vacancy; a hiatus.
- For Beatrice Nutter, there will always be conspicuous lacunae in our mutual understanding, but after almost 30 years here, the anomalies now delight rather than confound her.
- If the researcher cannot adequately hear a specific conversation due to its low volume or other acoustic interference, then this data point can be passed over with the understanding that such lacunae will be randomly distributed over the data collecting period.
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human-scienceslinguisticssciencesA small blank space; a gap or vacancy; a hiatus.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。