[koh-fuhngk-shuh n]

noun Trigonometry.

the function of the complement of a given angle or arc: cosθ is the cofunction of sinθ.

Nearby words

  1. coffinite,
  2. coffle,
  3. cofinal,
  4. cofound,
  5. cofounder,
  6. cog,
  7. cog in the wheel,
  8. cog railway,
  9. cog.,
  10. cogan-reese syndrome

Origin of cofunction

First recorded in 1905–10; co- + function Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Science definitions for cofunction



The trigonometric function of the complement of an angle. The tangent, for example, is the cofunction of the cotangent.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.