Furlong - Vine's Expository Dictionary of New Testament Words

Furlong

[ 1,,G4712, stadion ]
denotes
(a) a stadium," i.e., a measure of length, 600 Greek feet, or one-eighth of a Roman mile, Matthew 14:24 (in the best mss.); Luke 24:13; John 6:19; John 11:18; Revelation 14:20; Revelation 21:16;
(b) "a race course," the length of the Olympic course, 1 Corinthians 9:24.

Vine's Expository Dictionary of New Testament Words