## Etymology
From hebdomadal plus the adverbial suffix -ly; hebdomadal derives from Late Latin hebdomadalis, from Ancient Greek hebdomas ('a group of seven'), from hepta ('seven').

## AI Etymology
hebdomadally comes from hebdomadal plus the adverbial suffix -ly; hebdomadal derives from Late Latin hebdomadalis, from Ancient Greek hebdomas ('a group of seven'), from hepta ('seven'). 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 "on a weekly basis; once every week", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as hebdomad and hebdomadal. Its semantic neighborhood includes weekly, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Ancient Greek hebdomas.

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