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Wordnet Dictionary
Noun tangent has 2 senses
  1. tangent - a straight line or plane that touches a curve or curved surface at a point but does not intersect it at that point
    --1 is a kind of     straight line
  2. tangent, tan - ratio of the opposite to the adjacent side of a right-angled triangle
    --2 is a kind of trigonometric function, circular function
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