Definition of hypothesis
1a
: an assumption or concession made for the sake of argument
b
: an interpretation of a practical situation or condition taken as the ground for action
2
: a tentative assumption made in order to draw out and test its logical or empirical consequences
3
: the antecedent clause of a conditional statement
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Merriam-Webster unabridged
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Time Traveler for hypothesis
The first known use of hypothesis was in 1641
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