direction cosine

noun

Definition of direction cosine

: any of the cosines of the three angles between a directed line in space and the positive direction of the axes of a rectangular Cartesian coordinate system usually used in plural

First Known Use of direction cosine

circa 1889, in the meaning defined above

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The first known use of direction cosine was circa 1889

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Cite this Entry

“Direction cosine.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/direction%20cosine. Accessed 6 December 2019.

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