Definitions from Wiktionary (penumbra)

▸ noun:  A partially shaded area around the edges of a shadow, especially an eclipse.
▸ noun:  (astronomy) A region around the edge of a sunspot, darker than the sun's surface but lighter than the middle of the sunspot.
▸ noun:  (figuratively) An area of uncertainty or intermediacy between two mutually exclusive states or categories.
▸ noun:  (figuratively) An area that lies on the edge of something; a fringe.
▸ noun:  Something related to, connected to, and implied by, the existence of something else that is necessary for the second thing to be full and complete in its essential aspects.
▸ noun:  (medicine, preceded by "ischaemic", after a stroke) A region of the brain that has lost only some of its blood supply, and retains structural integrity but has lost function.
▸ Also see penumbra


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