Longman Dictionary of Contemporary English homepage

inversion

noun
     
Related topics: Meteorology
in‧ver‧sion [uncountable and countable]
1 formal the act of changing something so that it is the opposite of what it was before, or of turning something upside down (=the bottom is on the top and the top is on the bottom)
2 technicalHEM a type of weather condition in which the air nearest the ground is cooler than the air above it

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