Hebdomas literally translates into English as "the seventh day". The seventh day is the Sabbath.
"The Sabbath begins at nightfall on Friday and lasts until nightfall on Saturday. In practical terms the Sabbath starts a few minutes before sunset on Friday and runs until an hour after sunset on Saturday, so it lasts about 25 hours."
In Genesis 2:2-3 (King James Version), it reads:
 And on the seventh day God ended his work which he had made; and he rested on the seventh day from all his work which he had made.
 And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made.
In Exodus 20:8-11 (King James Version), it reads:
 Remember the sabbath day, to keep it holy.
 Six days shalt thou labour, and do all thy work:
 But the seventh day is the sabbath of the LORD thy God: in it thou shalt not do any work, thou, nor thy son, nor thy daughter, thy manservant, nor thy maidservant, nor thy cattle, nor thy stranger that is within thy gates:
 For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the LORD blessed the sabbath day, and hallowed it.
In Exodus 35:2 (King James Version), it reads:
 Six days shall work be done, but on the seventh day there shall be to you an holy day, a sabbath of rest to the LORD: whosoever doeth work therein shall be put to death.
In Exodus 31:17 (King James Version), it reads:
 It is a sign between me and the children of Israel for ever: for in six days the LORD made heaven and earth, and on the seventh day he rested, and was refreshed.
In Leviticus 23:3 (King James Version), it reads:
 Six days shall work be done: but the seventh day is the sabbath of rest, an holy convocation; ye shall do no work therein: it is the sabbath of the LORD in all your dwellings.
In Hebrews 4:9 (King James Version), it reads:
 There remaineth therefore a rest to the people of God.
In Psalms 118:24 (King James Version), it reads:
 This is the day which the LORD hath made; we will rejoice and be glad in it.
Remember the Sabbath (Hebdomas)
The Lord wants us to remember the Sabbath (the seventh day) and to keep it holy. What an important day Hebdomas is for worship, prayer and rest.
From Ancient Greek ἑβδομάς (hebdomás, “seven (noun), a week, a period of seven years”) (genitive ἑβδομάδος (hebdomádos)), from ἕβδομος (hébdomos).
hebdomas f (genitive hebdomadis); third declension
Etymology Provided by Wiktionary.org at https://en.wiktionary.org/wiki/hebdomas
Additional translation: https://books.google.com/books
The Sabbath For Man, Page 634: https://books.google.com/books
The Literature of the Sabbath Question, Page 352: https://books.google.com/books
The Book of Hebrews: Its Challenge from Zion, Page 144-145: https://books.google.com/books
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