Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: invertere, from vertere 'to turn'

invert

 verb
     
in‧vert [transitive] formal
to put something in the opposite position to the one it was in before, especially by turning it upside down (=the bottom is on the top and the top is on the bottom)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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