## Etymology
From hypothetical + -ly, ultimately from Ancient Greek hypothetikos ('conditional'), from hypothesis ('foundation, supposition'), from hypotithenai ('to put under, suppose'), from hypo ('under') + tithenai ('to put').

## AI Etymology
hypothetically comes from hypothetical + -ly, ultimately from Ancient Greek hypothetikos ('conditional'), from hypothesis ('foundation, supposition'), from hypotithenai ('to put under, suppose'), from hypo ('under') + tithenai ('to put'). Morphologically, the ending is part of the etymology: the suffix is attached to the older base named in the history, producing a later English derivative. In present English, the adverb sense is "in a supposed or assumed way; for the sake of argument", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as hypothesis, hypothetical, and hypothesize. Its semantic neighborhood includes supposedly, theoretically, conceivably, and speculatively, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Ancient Greek hypothesis and Ancient Greek tithenai.

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