Noun circular function has 1 sense
  1. trigonometric function, circular function - function of an angle expressed as a ratio of the sides of right-angled triangle containing the angle
    --1 is a kind of function, mathematical function
    --1 has particulars:
     sine, sin; cosine, cos; tangent, tan; cotangent, cotan; secant, sec; cosecant, cosec
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