Definition of obvert in English:

obvert

verb

[WITH OBJECT]Logic
  • Alter (a proposition) so as to infer another proposition with a contradictory predicate, e.g., “no men are immortal” to “all men are mortal.”

    • ‘In response to growing concern and upon the advice of a specially appointed committee, the rule was obverted.’
    • ‘An original statement is obverted, the result is converted and that result is obverted again.’

Origin

Early 17th century (in the sense ‘turn something until it is facing’): from Latin obvertere, from ob- ‘towards’ + vertere ‘to turn’.

Pronunciation

obvert

/äb-/