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sea-level pressure

American  
[see-lev-uhl] / ˈsiˌlɛv əl /

noun

  1. the atmospheric pressure, at any elevation, reduced by formula to a value approximating the pressure at sea level.

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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.