inversion - definition and synonyms

noun [countable/uncountable] 

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/ɪnˈvɜː(r)ʃ(ə)n/
singularinversion
pluralinversions
  1. 1
    formal a change that makes something the opposite of what it was before, or turns it upside down
  2. 2
    a weather condition in which the air near the ground is colder than the air above it