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[koh-fuhngk-shuh n]
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noun Trigonometry.
  1. the function of the complement of a given angle or arc: cosθ is the cofunction of sinθ.
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Origin of cofunction

First recorded in 1905–10; co- + function
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

collude, participate, conspire, cooperate, concur, concert, coact, cofunction, coproduce, interface

cofunction in Science


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