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[Latin (līnea) tangēns, tangent-, touching (line), present participle of tangere, to touch.]
A term describing a relationship of two figures (usually of the same dimension) in the neighborhood of a common point. The figures are tangent at a point P if they touch at P but do not intersect in a sufficiently small neighborhood of P. To be more precise, if P denotes a point of a curve C (see illustration), a line L is a tangent to C at P provided L is the limit of lines joining P to a variable point Q of C, as Q approaches P along C (that is, for Q sufficiently close to P, the line PQ is arbitrarily close to L).

Line L tangent to curve C at P.
noun
Of lines, curves, and surfaces: meeting at a single point and having, at that point, the same direction.
A line that touches a curve at a single point but does not cross the curve. The tangent of a circle at any point is at right angles to the radius of the circle at that point.
| tandem repeat, tandem mass spectrometry, tandem affinity purification | |
| tangential-flow filtration, tankyrase, tannic acid |

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In the action of a tangent piano, the tangent is the small slip of wood similar in shape to a harpsichord jack or similar to an unleathered fortepiano hammer which strikes the string to produce sound. It is similar to the tangent of a clavichord only in the sense that they both are driven ultimately by the player's finger to strike the string to initiate sound. In the clavichord, the tangent remains in contact with the string to keep the note sounding, while in the tangent piano, the tangent immediately rebounds from the string so that the string is allowed to vibrate freely (that is, it has an escapement).
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Dansk (Danish)
n. - tangent, tangens
adj. - tangent-, tangerende, berørende
idioms:
Nederlands (Dutch)
raaklijn, rakend aan
Français (French)
n. - tangente
adj. - tangent
idioms:
Deutsch (German)
n. - Tangens, Tangente
adj. - (sich) berührend
idioms:
Ελληνική (Greek)
n. - (μαθημ.) εφαπτομένη (γωνίας)
adj. - εφαπτόμενος
idioms:
idioms:
Português (Portuguese)
n. - tangente (f), tangente (f) trigonométrica (Mat.)
adj. - tangente
idioms:
Русский (Russian)
(мат.) тангент, касательная
idioms:
Español (Spanish)
n. - tangente
adj. - tangente
idioms:
Svenska (Swedish)
n. - tangent (geom. matem.)
adj. - tangerande, tangerings-, berörings-
中文(简体)(Chinese (Simplified))
切线, 正切, 接触的, 相切的, 切线的
idioms:
中文(繁體)(Chinese (Traditional))
n. - 切線, 正切
adj. - 接觸的, 相切的, 切線的
idioms:
한국어 (Korean)
n. - 접선, 탄젠트, 직선구간
adj. - ~에 접한
idioms:
日本語 (Japanese)
n. - 接線, 正接, 脱線
adj. - 接する, 接線の
idioms:
العربيه (Arabic)
(الاسم) ظل ألزاويه (صفه) خارج ألزاويه, مماس,
עברית (Hebrew)
n. - משיק - קו הנוגע בקו אחר בנקודה אחת, טנגנס - היחס בין הניצב שמול הזווית לניצב שליד הזווית במשולש ישר-זווית
adj. - נוגע, של משיק
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