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hypothesis (n.)

1590s, "a particular statement;" 1650s, "a proposition, assumed and taken for granted, used as a premise," from French hypothese and directly from Late Latin hypothesis, from Greek hypothesis "base, groundwork, foundation," hence in extended use "basis of an argument, supposition," literally "a placing under," from hypo- "under" (see hypo-) + thesis "a placing, proposition" (from reduplicated form of PIE root *dhe- "to set, put"). A term in logic; narrower scientific sense is from 1640s.

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Definitions of hypothesis from WordNet

hypothesis (n.)
a proposal intended to explain certain facts or observations;
hypothesis (n.)
a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena;
a scientific hypothesis that survives experimental testing becomes a scientific theory
Synonyms: possibility / theory
hypothesis (n.)
a message expressing an opinion based on incomplete evidence;
Synonyms: guess / conjecture / supposition / surmise / surmisal / speculation
From wordnet.princeton.edu