## Etymology
From Medieval Latin hebdomadarius ('weekly; one serving by the week'), from Late Latin hebdomas, from Ancient Greek hebdomas ('a group of seven'), from hepta ('seven').

## AI Etymology
hebdomadary comes from Medieval Latin hebdomadarius ('weekly; one serving by the week'), from Late Latin hebdomas, from Ancient Greek hebdomas ('a group of seven'), from hepta ('seven'). The path is chiefly one of transmission: the word passes through the named languages and forms, with each stage preserving part of the modern shape. In present English, the adjective sense is "weekly; a monk or canon serving in weekly rotation", 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 Medieval Latin hebdomadarius and Ancient Greek hebdomas.

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