The meaning of Sion in the Bible
(From International Standard Bible Encyclopedia)

si'-un (si'on; Seon):

(1) A name given to Mt. Hermon in Deuteronomy 4:48. The name may mean "protuberance" or "peak," and may have denoted the lofty snow-covered horn of the mountain as seen from the South. It may, however, be a scribal error for Sirion, the name by which the mountain was known to the Zidonians. Syriac takes it in this sense, which, however, may be a correction of the Hebrew. It is possible that this name, like Senir, may have applied to some distinct part of the Hermon Range.

(2) Mt. Sion.

See ZION.

See more on the meaning of Sion in the Bible:
Sion {Easton's Bible Dictionary}
Sion {Hitchcock's Bible Name}

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