tangent
/ˈtæn.d͡ʒənt/ noun, adjective, verb
Forms tangents tangenting tangented
- noun (differential geometry) A straight line touching a curve at a single point without crossing it there.
- noun (mathematics) A function of an angle that gives the ratio of the sine to the cosine, in either the real or complex numbers. Symbols: tan, tg.
- noun (transferred sense) A course suddenly and unexpectedly divergent from one which was previously being followed (especially one embarked on before reaching the end of the previous course).
- noun A new topic of discussion unrelated to the one which came before it, arrived at due to a single (peripheral or trivial) point in common with it. “I believe we went off onto a tangent when we started talking about monkeys on unicycles at his retirement party.”
- noun (art) A visual interaction between two or more lines or edges that creates a perceived relationship between them, often in a way that the artist did not intend.
- noun (music) A small metal blade in a clavichord that strikes the strings to produce sound.
- adjective (geometry) Touching a curve at a single point but not crossing it at that point.
- adjective Of a topic, only loosely related to a main topic.
- adjective (rail transport, of track) Straight; not horizontally curved. “The collision occurred on a two-mile stretch of tangent track.”
- verb (intransitive, informal, rare) Synonym of fly off at a tangent (“to digress from a topic”).
Synonyms
Etymology
Borrowed from Latin tangentem, the accusative of tangēns (“touching”) (in the phrase līnea tangēns (“a touching line”)), the present participle of the verb tangō (“touch”, verb), from Proto-Italic *tangō, from Proto-Indo-European *teh₂g- (“to touch”).
Cognate with Old English þaccian (“to touch lightly, pat, stroke”). More at thack, thwack.
Webster’s 1913
- noun 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. Artificial, or Logarithmic, tangent, the logarithm of the natural tangent of an arc. -- Natural tangent, a decimal expressing the length of the tangent of an arc, the radius being reckoned unity.
- adjective Touching; touching at a single point; specifically (Geom.)
- adjective 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. Tangent plane (Geom.), a plane which touches a surface in a point or line.
Etymology [L. tangens, -entis, p.pr. of tangere to touch; akin to Gr. tangente. Cf. Attain, Contaminate, Contingent, Entire, Tact, Taste, Tax, v. t.]
Etymology [L. tangens, -entis, p.pr.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “tangent”, CC BY-SA 4.0. Details