presumption noun

/prɪˈzʌmp.ʃən/ n [C or U]

Definition

when you believe that something is true without having any proof

The presumption of innocence is central to British law.

There is no scientific evidence to support such presumptions.

[+ that] The decision is based on the presumption that all information must be freely available.

(Definition of presumption noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

worried or nervous about something that is going to happen

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