1. In trigonometry, the secant of an angle minus one; the excess of the secant over unity.
Usage: mathematics; archaic or specialized

1. Of or relating to the exsecant function in trigonometry.
Usage: mathematics; archaic or specialized

Examples

• The exsecant was historically used in navigation calculations before modern trigonometric tables became standard.
• In older mathematical texts, the exsecant function appears alongside other trigonometric ratios.
• The exsecant of an angle is computed by subtracting one from the secant value.