hebdomad noun. ['hɛbdǝmad] Also (now rare) hebdomade [-eɪd]. M16.
[Late Latin from Greek hebdomas, -ad-, the number seven, period of seven days, from hepta seven: see -AD¹, -ADE.]
1. The number seven viewed collectively; a group of seven. M16-M19.

2. The space of seven days, a week, esp. with ref. to Daniel 9:24-7. E17.

3. In Gnosticism etc., a group of seven superhuman beings. Also, a title of the Demiurge. M19.

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