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A
A gap or missing portion, especially in a manuscript, text, or argument — a blank space where something should be but is absent.
— OED
B
In anatomy, a small cavity or depression in bone tissue, particularly the spaces occupied by osteocytes in compact bone.
— Anatomy reference
C
From the Latin lacuna meaning pit, pool, or hole, from lacus, a lake — evoking the image of a hollow or depression.
— Latin etymology
D
In music, a lacuna refers to a notated silence that is structurally significant — longer and more deliberate than a standard rest.
— Music theory
E
In Roman law, a lacuna legis described a gap in legislation that a magistrate was permitted to fill using customary law or judicial discretion.
— Roman jurisprudence