obvert
Concise Oxford English Dictionary © 2008 Oxford University Press:
obvert/əbˈvəːt/
▶verb 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’.
– derivatives
obversion noun.
obversion noun.
– origin C17: from L. obvertere, from ob- ‘towards’ + vertere ‘to turn’.
'obvert' also found in these Oxford entries:
