1. Plural of lacuna; gaps, spaces, or missing parts in a text, series, or structure.
Usage: Most common sense; used in academic and general contexts
2. Small cavities, pits, or spaces in bone, tissue, or other biological structures.
Usage: technical; anatomy/biology

Examples

• The manuscript contained several lacunae where pages had been lost over centuries.
• There are significant lacunae in our understanding of ancient Roman daily life.
• The historian noted lacunae in the historical record that made it difficult to piece together the timeline.
• In bone tissue, lacunae are small spaces occupied by osteocytes.
• The author's argument had obvious lacunae that weakened her conclusion.
• Despite extensive research, lacunae remain in our knowledge of how the disease develops.