masking

Noun
  1. The act of concealing the existence of something by obstructing the view of it (synset 101051609)
    "the cover concealed their guns from enemy aircraft"
  2. The blocking of one sensation resulting from the presence of another sensation (synset 105721294)
    "he studied auditory masking by pure tones"
  3. Scenery used to block the audience's view of parts of the stage that should not be seen (synset 103730689)

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