The meaning of Wall in the Bible
(From Easton's Bible Dictionary)

Cities were surrounded by walls, as distinguished from "unwalled villages" (Ezekiel 38:11; Leviticus 25:29-34). They were made thick and strong (Numbers 13:28; Deuteronomy 3:5). Among the Jews walls were built of stone, some of those in the temple being of great size (I Kings 6:7; 7:9-12; 20:30; Mark 13:1,2). The term is used metaphorically of security and safety (Isaiah 26:1; 60:18; Revelation 21:12-20). (See FENCE .)

See more on the meaning of Wall in the Bible:
Wall {International Standard Bible Encyclopedia}

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