1. inheritance
2. heritage, ground
3. view, aspect, prospect, scene, vista, panorama, background knowledge
4. information, background signal
5. noise, interference, disturbance, accompaniment
6. concomitant, co-occurrence, setting
7. scope, environment, desktop
8. screen background, screen, CRT screen, backdrop

1. backcloth, scenery, scene, play down
1. downplay, stress, emphasize, emphasise, punctuate, accent, accentuate