Hebdomadally is a rarely used term to describe something that happens once a week. While it's a useful word for those in specialized fields, finding synonyms for it is often necessary when communicating with a broader audience. Weekly, weekly basis, every seven days, once a week, and seven-day intervals are all appropriate alternatives to consider. Other possibilities include weekly occurrence, weekly event, and weekly routine. By using any of these variations, you can replace hebdomadally with a more easily understandable term without losing any of its intended meaning.