ebdomades

εβδομάδες N-NPF (noun, nominative, plural, feminine)

εβδομάδας N-APF (noun, accusative, plural, feminine)

εβδομάδος N-GSF (noun, genative, singular, feminine)

εβδομάδων N-GPF (noun, genative, plural, feminine)

εβδομας N-NSF (noun, nominative, singular, feminine)



Accusative: direct object; motion toward; time: "how long".

Dative: indirect object, "to"; also location, "in" or "at"; instrument, "with".

Nominative: subject; predicate nominative

Genative: possession, "of"; also origin or separation "from".



The phrase "periods of seven" is the Greek word: εβδομάδες

Now... let's examine how ebdomades is used in Daniel 9.

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εβδομάδες - "periods of seven"

Dan 9:24  Seventy weeks have been decreed for your people and your holy city, 

[LXX] Dan 9:24  Seventy εβδομάδες [periods of seven] were rendered concise upon your people, and upon the city holy...

Dan 9:25  So you are to know and discern that from the issuing of a decree to restore and rebuild Jerusalem until Messiah the Prince there will be seven weeks and sixty-two weeks; it will be built again, with plaza and moat, even in times of distress.

[LXX] Dan 9:25  And you shall know and perceive, from the delivery of the word to respond and to build Jerusalem until the anointed one leading - εβδομάδες [periods of seven] seven, and εβδομάδες [periods of seven] sixty-two again shall be built the square and wall in straits of the times.

[LXX] Lev 25:8  And you shall count out to yourself seven rests of years, seven years seven times.  And they will be to you seven εβδομάδες [periods of seven] of years, nine and forty years.
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εβδομάδας - "periods of seven"

Dan 9:26  Then after the sixty-two weeks the Messiah will be cut off and have nothing, and the people of the prince who is to come will destroy the city and the sanctuary. And its end will come with a flood; even to the end there will be war; desolations are determined.

[LXX] Dan 9:26  And after the εβδομάδας [periods of seven] sixty-two shall be utterly destroyed the anointing and judgment is no longer in it.  And the city and the holy place he shall corrupt with the one taking the lead to the one coming and they shall be cut off as in a flood and until the end of war being terminated he shall order in extinctions.

[LXX] Dan 10:2  In those days, I Daniel was mourning three εβδομάδας [periods of seven] of days.

[LXX] Lev 23:15  And you shall count to yourselves from the next day of the Sabbaths, from the day which ever you should bring the sheaf of the increase offering seven εβδομάδας [periods of seven] entire

[LXX] Deu 16:9  Seven εβδομάδας [periods of seven] entire you shall count out to yourself with the beginning of your sickle upon the harvest you shall begin to count out seven εβδομάδας [periods of seven]. 
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εβδομάδος - "period of seven"

[LXX] Dan 9:27  And he shall strengthen covenant with many εβδομάς [period of seven] one; and in the half of the εβδομάδος [period of seven] shall be lifted away sacrifice and libation offering, and upon the temple an abomination of the desolations will be; and until the completion of time, completion shall be given unto the desolation.

[LXX] Lev 23:16  until the next day of the last εβδομάδος [period of seven] you shall count fifty days, and you shall bring sacrifice offering a new to the LORD. 
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εβδομάδων - "period of sevens"

Dan 10:3  I did not eat any tasty food, nor did meat or wine enter my mouth, nor did I use any ointment at all until the entire three weeks were completed. 

[LXX] Dan 10:3  Bread of desirable I ate not and meat and wine did not go into my mouth and an anointing I did not anoint with until the fullness of the three εβδομάδων [period of sevens] of days.

[LXX] Exo 34:22  And a holiday εβδομάδων [of a period of sevens] you shall observe to me, the beginning of the harvest of wheat, and a holiday gathering being in the the middle of the year.

[LXX] Num 28:26  And the day of the new produce, whenever you should bring sacrifice a new produce to the LORD των [of the] εβδομάδων [period of sevens] summoning a holy it will be to you.  All work servile you shall not do.

[LXX] Deu 16:10  And you shall observe the holiday εβδομάδων [(of the) period of sevens] to the LORD your God, as your hand is strong in as much as should give to you in so far as he blessed you the LORD your God.

[LXX] Deu 16:16  Three times of the year shall appear every male of yours before the LORD you God in the place in which ever should have chosen the LORD in the holiday of the unleavened breads, and in the holiday των [of the] εβδομάδων [period of sevens], and in the holiday of the pitching of tents.  You shall not appear in the presence of the LORD your God empty.

[LXX] 2Ch 8:13  according to the reckoning, day by day, to offer according to the commandments of Moses on the Sabbaths and at the months and in the holidays three times during the year - in the holiday of the unleavened breads and in the holiday των [of the] εβδομάδων [period of sevens] and in the holiday of the tents.