presuppose ?

Relies on evidence presented in terms that presuppose the truth of the claim for which the evidence is offered.

What does it mean " presuppose " in that sentence ? I look at the dictionary. I still dont get it when I read that sentence.

1 to think that something is true in advance without having any proof:
[+ that] You're presupposing that he'll have told her - but he may not have.

2 FORMAL If an idea or situation presupposes something, that thing must be true for the idea or situation to work:
Investigative journalism presupposes some level of investigation.
[+ that] All this presupposes that he'll get the job he wants.

presupposition http://dictionary.cambridge.org/define.asp?dict=CALD&key=62707&ph=on
noun [C or U]
Your actions are based on some false presuppositions (= things that you think without knowing the truth).
This is all presupposition - we must wait until we have some hard evidence.

Thanks