IPA: /hɛbˈdɒmədəli/
KK: /hɛbˈdɒmədəli/
Occurring every seven days; happening once a week.
The club meets hebdomadally to discuss their projects.
Hebdomadally is formed from "hebdomas" (from Greek "ἑβδομάς", meaning week) and the suffix "-ally" (meaning in a manner relating to). The word refers to something that occurs on a weekly basis, or in a manner pertaining to weeks.
Think of 'hebdomas' meaning week, and remember that 'hebdomadally' describes something happening weekly.
No commonly confused words.