To propose a tentative explanation or theory that can be tested through further investigation or experimentation.
From Greek 'hypothesis' meaning 'foundation' or 'supposition,' from 'hypo' (under) and 'thesis' (placing). The scientific method adopted this term in the 17th century to describe testable propositions.
A hypothesis is like putting an idea 'under' examination - it's your educated guess that you place under the microscope of testing. Think 'hypo-' (under) + 'thesis' (your theory).
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