Tangent
/tˈændʒənt/
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Definition
(noun) A straight line touching a curve at a single point without crossing it there.
Sentence Examples
"Eh? Is the tangent cosine divided by sine?" "Other way round!"
Tom went off on a tangent.
CEFR Practice Quiz
During the boring lecture, the professor suddenly went off on a ____ and started talking about his recent trip to Paris today.