masking in WordNet English dictionary

1. the act of concealing the existence of something by obstructing the view of it
   "the cover concealed their guns from enemy aircraft"
   cover  covering  screening  masking 
   
2. scenery used to block the audience's view of parts of the stage that should not be seen
   masking piece  masking 
   
3. the blocking of one sensation resulting from the presence of another sensation
   "he studied auditory masking by pure tones"
   masking