tangent

[ tan-juhnt ]

adjective

1. in immediate physical contact; touching.

   Synonyms: meeting

2. Geometry.
   1. touching at a single point, as a tangent in relation to a curve or surface.
   2. in contact along a single line or element, as a plane with a cylinder.
3. tangential ( def 3 ).

noun

1. Geometry. a line or a plane that touches a curve or a surface at a point so that it is closer to the curve in the vicinity of the point than any other line or plane drawn through the point.
2. Trigonometry.
   1. (in a right triangle) the ratio of the side opposite a given angle to the side adjacent to the angle.
   2. Also called tan. (of an angle) a trigonometric function equal to the ratio of the ordinate of the end point of the arc to the abscissa of this end point, the origin being at the center of the circle on which the arc lies and the initial point of the arc being on the x-axis. : tg, tgn
   3. (originally) a straight line perpendicular to the radius of a circle at one end of an arc and extending from this point to the produced radius which cuts off the arc at its other end.
3. the upright metal blade, fastened on the inner end of a clavichord key, that rises and strikes the string when the outer end of the key is depressed.

tangent

/ ˈtændʒənt /

noun

1. a geometric line, curve, plane, or curved surface that touches another curve or surface at one point but does not intersect it
2. (of an angle) a trigonometric function that in a right-angled triangle is the ratio of the length of the opposite side to that of the adjacent side; the ratio of sine to cosine tan
3. the straight part on a survey line between curves
4. music a part of the action of a clavichord consisting of a small piece of metal that strikes the string to produce a note
5. on a tangent or at a tangent
   on a completely different or divergent course, esp of thought

   to go off at a tangent

adjective

1. 1. of or involving a tangent
   2. touching at a single point
2. touching
3. almost irrelevant

tangent

/ tăn′jənt /

1. A line, curve, or surface touching but not intersecting another.
2. The ratio of the length of the side opposite an acute angle in a right triangle to the side adjacent to the angle. The tangent of an angle is equal to the sine of the angle divided by the cosine of the angle.
3. The ratio of the ordinate to the abscissa of the endpoint of an arc of a unit circle centered at the origin of a Cartesian coordinate system, the arc being of length x and measured counterclockwise from the point (1, 0) if x is positive or clockwise if x is negative.
4. A function of a number x, equal to the tangent of an angle whose measure in radians is equal to x.

Derived Forms

• ˈtangency, noun

Other Words From

• quasi-tangent adjective

Word History and Origins

Origin of tangent¹

First recorded in 1585–90; from Latin tangent-, stem of tangēns “touching” (present participle of tangere “to touch”), in phrase līnea tangēns “touching line”

Word History and Origins

Origin of tangent¹

C16: from Latin phrase līnea tangēns the touching line, from tangere to touch

Idioms and Phrases

Idioms

1. off on / at a tangent, digressing suddenly from one course of action or thought and turning to another:

   The speaker flew off on a tangent.

More idioms and phrases containing tangent

see on a tangent .

Example Sentences

The option to create new threads from a text channel is one of the newer features added to Discord in recent months, and it can be really helpful when conversations keep going off on tangents.

From Popular-Science

The third-party cookie still stands at a crucial intersection between digital marketing, SEO, paid media, web design, and several business tangents.

From Search Engine Watch

Between where there were two possible directions and zero possible directions, there was one — where the line was tangent to the circle.

From FiveThirtyEight

At no time were you allowed to venture into the wall, though you were permitted to be tangent to the wall or on a grid point along a wall.

From FiveThirtyEight

To remove as much area as possible, each of those cuts would have been tangent to the circle while making a 45 degree angle with the sides of the square.

From FiveThirtyEight

Then, the next morning, he did that radio show and went on his notorious tangent about Chuck Lorre.

From The Daily Beast

Not every tangent Jacobson follows is particularly illuminating, as he is the first to admit.

From The Daily Beast

At last the climbing trail dipped into a level tangent just below the top of the mountain.

From Project Gutenberg

Mr. Benjamin had been in the neighborhood, but, hearing that the enemy were in Madison, had gone off at a tangent.

From Project Gutenberg

The mere thought of the hospital sent her mind flying off at a tangent.

From Project Gutenberg

The last wipe should be a quick stroke coming off of joint on a tangent.

From Project Gutenberg

Two guns were for a time in the hands of the Boers, who, I believe, removed the tangent sights.

From Project Gutenberg