on chapter 9 part 2: Define blackwhite. Why is its definition important to the Party’s survival?

"Blackwhite," is another form of mental discipline. It is either an opponent's insolent claim that black is white, or a Party member's laudable willingness to claim black is white for the Party's sake. A little confusing, but again, it identifies members of the party or helps those wanting to fool the Party to do so.