TANGENT
\tˈand͡ʒənt], \tˈandʒənt], \t_ˈa_n_dʒ_ə_n_t]\
Definitions of TANGENT
 2006  WordNet 3.0
 2011  English Dictionary Database
 2010  New Age Dictionary Database
 1913  Webster's Revised Unabridged Dictionary
 1919  The Winston Simplified Dictionary
 1894  The Clarendon dictionary
 1919  The Concise Standard Dictionary of the English Language
 1914  Nuttall's Standard dictionary of the English language
 1874  Etymological and pronouncing dictionary of the English language
 1871  The Cabinet Dictionary of the English Language
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a straight line or plane that touches a curve or curved surface at a point but does not intersect it at that point
By Princeton University

a straight line or plane that touches a curve or curved surface at a point but does not intersect it at that point
By DataStellar Co., Ltd

A tangent line curve, or surface; specifically, that portion of the straight line tangent to a curve that is between the point of tangency and a given line, the given line being, for example, the axis of abscissas, or a radius of a circle produced. See Trigonometrical function, under Function.

Touching; touching at a single point

meeting a curve or surface at a point and having at that point the same direction as the curve or surface;  said of a straight line, curve, or surface; as, a line tangent to a curve; a curve tangent to a surface; tangent surfaces.
By Oddity Software

A tangent line curve, or surface; specifically, that portion of the straight line tangent to a curve that is between the point of tangency and a given line, the given line being, for example, the axis of abscissas, or a radius of a circle produced. See Trigonometrical function, under Function.

Touching; touching at a single point

meeting a curve or surface at a point and having at that point the same direction as the curve or surface;  said of a straight line, curve, or surface; as, a line tangent to a curve; a curve tangent to a surface; tangent surfaces.
By Noah Webster.

Touching; in geometry, meeting a curve only at one point, but not cutting it.

A straight line that meets or touches a circle or curve, but does not cut it; any line or course leading abruptly away from the usual course.
By William Dodge Lewis, Edgar Arthur Singer
By William Hand Browne, Samuel Stehman Haldeman
By James Champlin Fernald

A right line which touches a curve, but which, when produced, does not cut it. Tangent of an arc, a right line drawn touching one extremity of the arc, and limited by a secant or line drawn through the centre and the other extremity.
By Nuttall, P.Austin.

In trig. and geom., a straight line which touches a circle or curve, but though produced, does not cut it.
By Stormonth, James, Phelp, P. H.

n. [Latin] A right line which touches a curve, but which, when produced, does not cut it, as a c;in trigonometry, the tangent of an arc is a straight line drawn from one extremity of the arc, and meeting the diameter passing through the other extremity. Thus, let c b be an arc, d b the diameter, then a c is the tangent of the arc c b and of the angle c d b, of which the arc is the measure.