Don’t blame me. It’s all Villainous Company’s fault.
1. A partial shadow, as in an eclipse, between regions of complete shadow and complete illumination. See synonyms at shade.
2. The grayish outer part of a sunspot.
3. An area in which something exists to a lesser or uncertain degree: “The First Amendment has a penumbra where privacy is protected from governmental intrusion” (Joseph A. Califano, Jr.).
4. An outlying surrounding region; a periphery: “Downtown Chicago and its penumbra also stand rejuvenated” (John McCormick).
ETYMOLOGY: New Latin pnumbra : Latin paene, almost + Latin umbra, shadow.