The word "tangent" can have several meanings depending on the context in which it is used:
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Mathematics: In geometry, a tangent refers to a line that touches a curve at a single point without crossing it. In trigonometry, the tangent function relates to the ratio of the length of the opposite side to the length of the adjacent side in a right triangle.
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General Use: In more general language, "tangent" can refer to a remark or a topic that diverges from the main subject. For example, if someone is discussing one topic and then starts talking about something unrelated, you might say they went off on a tangent.
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Physics and Engineering: In physics, tangent can refer to a vector that is perpendicular to the radius at a point on a circle, indicating the direction of motion.
If you have a specific context in mind, please let me know for a more tailored definition!