vanishing point - definition and synonyms

noun 

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/ˈvænɪʃɪŋ ˌpɔɪnt/
singularvanishing point
pluralvanishing points
  1. 1
    [countable] art the point in the distance where two parallel lines appear to become one line
  2. 2
    [countable/uncountable] the point at which something is no longer important