Source : Webster's Revised Unabridged Dictionary (1913)

Hebdomadally \Heb*dom"a*dal*ly\, adv.
   In periods of seven days; weekly. --Lowell.

Source : WordNet®

hebdomadally
     adv : without missing a week; "she visited her aunt weekly" [syn:
           {weekly}, {every week}, {each week}]