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linear interpolation

American  
[lin-ee-er in-tur-puh-ley-shuhn] / ˈlɪn i ər ɪnˌtɜr pəˈleɪ ʃən /

noun

  1. a mathematical operation that determines the value of points along a straight line between two given points.

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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.