hebdomadal
/hebˈdɒmədəl/adjective
- formal weekly (used especially of organizations which meet weekly)〈正式〉（尤用于有每周例会的组织或机构）每周一次的; 每周的：
Oxford University's Hebdomadal Council.
牛津大学的理事会周会。
词源
early 17th cent. （in the sense 'lasting seven days'）： from late Latin hebdomadalis, from Greek hebdomas, hebdomad- 'the number seven, seven days', from hepta 'seven'.