1610s, from Late Latin hebdomadalis, from Latin hebdomas "seven, the seventh day; a week" (see hebdomad). In later use as pedantic humor.
Entries linking to hebdomadal
hebdomad n.
1540s, "the number seven;" c. 1600, "a week;" from Latin hebdomad-, stem of hebdomas "seven, the seventh day; a week," from Greek hebdomas "the number seven; a period of seven (days)," from hepta "seven" (from PIE *septm; see seven) + -mos, suffix used to form ordinal numbers, cognate with Latin -mus.
hebdomadally adv.
"weekly," 1798, pedantic humor, from hebdomadal + -ly (2).