WordReference Random House Unabridged Dictionary of American English © 2017
heb•dom•a•dal  (heb domə dl),USA pronunciation adj. 
  1. taking place, coming together, or published once every seven days;
    weekly:hebdomadal meetings;hebdomadal groups;hebdomadal journals.

  1. a weekly magazine, newspaper, etc. Cf. diurnal (def. 7).
heb•doma•dal•ly, adv. 
  • Late Latin hebdomadālis. See hebdomad, -al1
  • 1605–15

Collins Concise English Dictionary © HarperCollins Publishers::

hebdomadal /hɛbˈdɒmədəl/ adj
  1. a rare word for weekly

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