masking

noun

1. the act of concealing the existence of something by obstructing the view of it

   noun.act

   Synonyms cover covering screening

   Source: WordNet 3.0

2. the blocking of one sensation resulting from the presence of another sensation

   noun.cognition

   Examples

   He studied auditory masking by pure tones.

   Source: WordNet 3.0

3. scenery used to block the audience's view of parts of the stage that should not be seen

   noun.artifact

   Synonyms masking piece

   Source: WordNet 3.0