Easton's Bible Dictionary (1897)
A strong fenced enclosure for the protection of the sheep gathered within it (Num. 32:24; 1 Chr. 17:7; Ps. 50:9; 78:70). In John 10:16 the Authorized Version renders by “fold” two distinct Greek words, aule and poimne, the latter of which properly means a “flock,” and is so rendered in the Revised Version.