An assumption based on reasonable evidence; arrogant or impertinent behavior; a legal principle assuming something is true until proven otherwise.
From Latin praesumptio, from praesumere meaning 'to take beforehand'. Combined prae (before) and sumere (to take). The arrogance sense developed from 'taking too much upon oneself'.
Presumption beautifully captures how assumptions can be both reasonable (legal presumption of innocence) and problematic (presumptuous behavior) - it's all about whether you're taking the right amount beforehand!
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