Σιών, indeclinable (its grammatical gender in the N. T. does not appear from the passages in which it is mentioned; cf. 
Buttmann, 21f (19); in the 
Sept. when it denotes the city of Jerusalem 
ἡ Σιών occurs, as Psalm 101:14, 17 (
Ps. 102:14,
17); Psalm 131:13 (
Ps. 132:13); 
Psalm 136:1 (
Ps. 137:1), Hebrew 
צִיון (i. e. according to some, 'protected' or 'protecting'; according to others, 'sunny'; others besides); 
Sion (so 
A. V., but properly (with 
R. V.)) 
Zion; 
1. the hill on which the higher and more ancient part of Jerusalem was built (
דָּוִד עִיר, 
city of David, because David captured it); it was the southwesternmost and highest of the hills on which the city stood; (many now would identify it with the eastern hill, some with the northern; cf. Furrer in 
Schenkel iii. 216ff; Mühlau in 
Riehm, under the word; per contra Wolcott in 
B. D. American edition, under the word; Schultz in 
Herzog edition 2 vi., p. 543f). 
2. used very often for the entire city of Jerusalem itself: 
Romans 9:33 and 
1 Peter 2:6 (after 
Isaiah 28:16); 
Romans 11:26 (from 
Isaiah 59:20); 
ἡ θυγάτηρ Σιών (see 
θυγάτηρ, b.
β'.), 
Matthew 21:5; 
John 12:15. 
3. Since Jerusalem, because the temple stood there, was called the dwelling-place of God (cf. 
Matthew 5:35; 
κύριος τήν Σιών ᾑρετίσατο εἰς κατοικίαν ἑαυτῷ, Psalm 131:13 (
Ps. 132:13)), the expression 
τό Σιών ὄρος is transferred to heaven, as the true dwelling-place of God and heavenly beings, the antitype of the earthly Zion: 
Hebrews 12:22; 
Revelation 14:1. 
    THAYER’S GREEK LEXICON, Electronic Database.
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BLB Scripture Index of Thayer's