Penumbra

penumbra \pə-ˈnəm-brə\ noun: 1 a. a space of partial illumination (as in an eclipse) between the perfect shadow on all sides and the full light, b. a shaded region surrounding the dark central portion of a sunspot,
 2. a surrounding or adjoining region in which something exists in a lesser degree; fringe,
 3. a body of rights held to be guaranteed by implication in a civil constitution, 
4. something that covers, surrounds or obscures; shroud {a penumbra of secrecy} {a penumbra of somber dignity has descended over his reputation — James Atlas}

Etymology: New Latin, from Latin paene almost + umbra shadow

Lots of good definitions here, people. Let’s start using them!