OUTER

out'-er: This adjective is used 12 times by Ezekiel of the outside court of the temple. In Matthew we find it 3 times (8:12; 22:13; 25:30) in "outer darkness" (to skotos to exoteron), which typifies the utter darkness of the doom of the lost.

From the International Standard Bible Encyclopedia
Edited by James Orr, published in 1939 by Wm. B. Eerdmans Publishing Co.