The Methodists of Octavius looked upon him as a queer fish, and through nearly a dozen years had never quite outgrown their hebdomadal tendency to surprise at seeing him enter their church.
-- Harold Frederic, The Damnation of Theron Ware, 1896
A little solace came at tea-time, in the shape of a double ration of bread—a whole, instead of a half, slice—with the delicious addition of a thin scrape of butter: it was the hebdomadal treat to which we all looked forward from Sabbath to Sabbath.
-- Charlotte Brontë, Jane Eyre, 1847
Hebdomadal ultimately comes from the Greek term hébdomos meaning "seventh."