When you assume some fact at the very beginning of an argument, that's presupposition. If a book critic decides that a novel is intended for young adult readers before writing her review, she makes a presupposition.

When you presuppose, you make an assumption about something from the start, and presupposition is the action of presupposing. Your presupposition about how terrible a movie is going to be might color your actual experience of watching it, for example. The noun presupposition comes straight from the Medieval Latin praesuppositionem, which combines prae-, "before," and suppositio, "suppose."

Definitions of presupposition
  1. noun
    the act of presupposing; a supposition made prior to having knowledge (as for the purpose of argument)
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    type of:
    supposal, supposition
    the cognitive process of supposing
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