hebdomad

[ heb-duh-mad ]
/ ˈhɛb dəˌmæd /

noun

the number seven.
a period of seven successive days; week.

Origin of hebdomad

1535–45; < Latin hebdomad- < Greek (stem of hebdomás week), equivalent to hébdom(os) seventh (see hepta-) + -ad- -ad1

British Dictionary definitions for hebdomad

hebdomad
/ (ˈhɛbdəˌmæd) /

noun

obsolete the number seven or a group of seven
a rare word for week

Word Origin for hebdomad

C16: from Greek, from hebdomos seventh, from heptas seven