Longman Dictionary of Contemporary English homepage

presuppose

verb
     
pre‧sup‧pose [transitive] formal
1 to depend on something that is believed to exist or to be true [= assume]:
The idea of heaven presupposes the existence of God.
presuppose that
Your argument presupposes that Dickens was a social reformer.
2 to have to happen if something is true:
Without struggle there can be no progress, and struggle presupposes winners and losers.

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