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stationary front

noun Meteorology.
  1. a front between warm and cold air masses that is moving very slowly or not at all.
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Origin of stationary front

First recorded in 1935–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
stationary front in Science

stationary front

[stā′shə-nĕr′ē]
  1. A transition zone between two nearly stationary air masses of different density. See more at front.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.