(noun) Something that covers, surrounds, or obscures; surrounding region in which something exists in a lesser degree; In astronomy: partial shadow outside of completely shaded area, like in an eclipse or the outside of a sunspot. In painting: where light and shade blend.
- June realized her colleague was working in a penumbra of immorality when he endorsed the product whose representatives afforded him the most appealing perks.
- Looking through the telescope, June saw the penumbra of light that surrounded it.
- A penumbra of heaviness set over the stadium as medics carried June from the field on a stretcher.