IPA: /hɛbˈdɒmədəl/
KK: /hɛbˈdɒmədəl/
Relating to or occurring every week.
The hebdomadal meeting is scheduled for every Monday.
Hebdomadal is formed from "hebdomas" (from Greek "hebdomas", meaning week) and the suffix "-al" (meaning pertaining to). The word refers to something that is related to or occurring every week.
Think of 'hebdomas' meaning week, and remember that 'hebdomadal' refers to something that happens weekly.
No commonly confused words.