Толковый словарь английского языка Oxford English Reference - tangent
Tangent
tangent
n. & adj. --n. 1 a straight line, curve, or surface that meets another curve or curved surface at a point, but if extended does not intersect it at that point. 2 the ratio of the sides opposite and adjacent to an angle in a right-angled triangle. --adj. 1 (of a line or surface) that is a tangent. 2 touching. Phrases and idioms at a tangent diverging from a previous course of action or thought etc. (go off at a tangent). tangent galvanometer a galvanometer with a coil through which the current to be measured is passed, its strength being proportional to the tangent of the angle of deflection. Derivatives tangency n. Etymology: L tangere tangent- touch
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1.
I. adjective Etymology: Latin ~-, tangens, present participle of tangere to touch; perhaps akin to Old English thaccian to touch gently, stroke Date: 1594 1. meeting a curve or surface in a single point if a sufficiently small interval is considered , b. having a common ~ line at a point , having a common ~ plane at a point , diverging from an original purpose or course ; irrelevant , II. noun Etymology: New Latin ~-, tangens, from linea tangens ~ line Date: 1594 1. the trigonometric function that for an acute angle is the ratio between the leg opposite to the angle when it is considered part of a right triangle and the leg adjacent, a trigonometric function that is equal to the sine divided by the cosine for all real numbers θ for which the cosine is not equal to zero and is exactly equal to the ~ of an angle of measure θ in radians, a line that is ~, an abrupt change of course ; digression , a small upright flat-ended metal pin at the inner end of a clavichord key that strikes the string to produce the tone ...Толковый словарь английского языка
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