- A region where differentiating between aspects or results can be challenging due to ambiguity or uncertainty
- The broadening of safeguard, influence, usage, or attention beyond its original scope
- The judge explained that the case fell into a penumbra of the law, making it hard to determine its outcome.
- The legal penumbra around the legislation expanded its application beyond the initial intention.
- The penumbra of the legal document made it difficult to conclusively decide its implications.