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tangent

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tangent/ˈtænʤənt/noun
pluraltangents
tangent
/ˈtænʤənt/
noun
pluraltangents
Learner's definition of TANGENT  
[count]geometry
: a line that touches a sphere or circle at only one point

go off on a tangent

(US)or Britishgo off at a tangent
: to start talking about something that is only slightly or indirectly related to the original subject
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