noun
an act of taking for granted or supposing; a supposition
verb
to take for granted or without proof; to suppose
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It is unwise to assume that all the data is accurate without thorough verification.
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Don't just assume he will be there without confirming with him first.
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I assumed she was cool with it, but turns out she was actually upset.
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Never assume the grass is greener on the other side without experiencing it yourself.