1: τεῖχος
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(Strong's #5038 — Noun Neuter — teichos — ti'-khos )

"a wall," especially one around a town, is used (a) literally, Acts 9:25; 2—Corinthians 11:33; Hebrews 11:30; (b) figuratively, of the "wall" of the heavenly city, Revelation 21:12,14,15,17-19 .

2: τοῖχος
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(Strong's #5109 — Noun Masculine — toichos — toy'-khos )

"a wall," especially of a house, is used figuratively in Acts 23:3 , "(thou whited) wall."

3: μεσότοιχον
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(Strong's #3320 — Noun Neuter — mesotoichon — mes-ot'-oy-khon )

"a partition wall" (mesos, "middle," and No. 2), occurs in Ephesians 2:14 , figuratively of the separation of Gentile from Jew in their unregenerate state, a partition demolished by the Cross for both on acceptance of the Gospel. Cp. PARTITION.