Secant is a term in mathematics derived from the Latin secare ("to cut"). It may refer to:

• a secant line, in geometry
• the secant variety, in algebraic geometry
• secant (trigonometry) (Latin: secans), the multiplicative inverse (or reciprocal) trigonometric function of the cosine
• the secant method, a root-finding algorithm in numerical analysis, based on secant lines to graphs of functions
• a secant ogive in nose cone design

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Look up secant in Wiktionary, the free dictionary.