Hypothesis
late 16th century: via late Latin from Greek hupothesis ‘foundation’, from hupo ‘under’ + thesis ‘placing’.
wiktionary
Recorded since 1596, from Middle French hypothese, from Late Latin hypothesis, from Ancient Greek ὑπόθεσις(hupóthesis, “base, basis of an argument, supposition”, literally “a placing under”), itself from ὑποτίθημι(hupotíthēmi, “I set before, suggest”), from ὑπό(hupó, “below”) + τίθημι(títhēmi, “I put, place”).
etymonline
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.
