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n.
a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence); "speculations about the outcome of the election"; "he dismissed it as mere conjecture"
n.
a statement that is assumed to be true and from which a conclusion can be drawn; "on the assumption that he has been injured we can infer that he will not to play"
n.
a statement or assertion of verified information about something that is the case or has happened; "he supported his argument with an impressive array of facts"