This is the 13101st most frequent German word.
alljährlichen
"Alljährlichen" means "annual" or "yearly."
The word 'alljährlichen' is used as an adjective to describe the festival that takes place every year.
Beim alljährlichen Fest im Dorf treffen sich alle Bewohner.
At the annual festival in the village, all residents meet.
Here 'alljährliches' modifies 'Konzert' (concert), indicating it is held once every year strictly.
Die Stadt veranstaltet ein alljährliches Konzert für die Öffentlichkeit.
The city organizes an annual concert for the public.
In this case, 'alljährlichen' describes the marathon, specifying its occurrence as a yearly event.