adumbration adumbration /ˌædəmˈbreɪʃən/

noun

1. A sketchy, imperfect or faint representation  ( adumbration )
   a sketchy, imperfect or faint representation
   
2. The act of providing vague advance indications; representing beforehand  ( adumbration , foreshadowing , prefiguration )
   the act of providing vague advance indications; representing beforehand