/ ɪnˈvɜːʃn; NAmE ɪnˈvɜːrʃn; -ʒn/ noun
[ U , C ] ( technical ) the act of changing the position or order of sth to its opposite, or of turning sth upside down :
the inversion of normal word order
an inversion of the truth
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WORD ORIGIN
mid 16th cent. (as a term in rhetoric, denoting the turning of an argument against the person who put it forward): from Latin inversio(n-) , from the verb invertere literally turn inside out, from in- into + vertere to turn.