Definition of cosecant in English:



  • The ratio of the hypotenuse (in a right-angled triangle) to the side opposite an acute angle; the reciprocal of sine.

    ‘The other angle, B has its tanglent equal to its cosecant (the reciprocal of the sine).’
    • ‘The variance of D is computed from the variance of the misclosure W scaled with the separation of the planes of position dv and the cosecant of the angle of maximum inclination of the slope dd.’
    • ‘The secant and cosecant were not used by the early astronomers or surveyors.’
    • ‘No I'm not, that's quite the negative cosecant.’
    • ‘‘Negative cosecant squared x,’ I murmured, feeling as light-headed and tingle-infested as I had when I'd received a perfect score.’



/kōˈsēkənt/ /koʊˈsikənt/


Early 18th century from modern Latin cosecant-, from co-‘mutually’ + Latin secant- ‘cutting’ (from the verb secare). Compare with secant.