hypothesis

The word 'hypothesis' entered English in the late 16th century via Late Latin from its Greek ancestor 'hypothesis,' which literally meant "a placing under" or "foundation." This Greek term was a compound of 'hypo-' (under) and 'thesis' (a placing, from the verb 'tithenai,' to put). The conceptual journey from a physical "foundation" to an intellectual one is clear: in ancient Greek rhetoric and philosophy, a 'hypothesis' was a supposition laid down as the basis for an argument. This logical foundation evolved into the modern scientific meaning—a testable proposition that serves as the groundwork for empirical inquiry, retaining the core idea of something posited as a starting point.

Structure: hypo (under) + thesis (placing) hypo- is a prefix of Greek origin meaning "under, beneath, or less than." -thesis is a combining form from Greek, meaning "a placing, setting down, or proposition."