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direction number

American  

noun

Mathematics.

  1. the component of a vector along a given line; any number proportional to the direction cosines of a given line.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.