Abbott-Smith Manual Greek Lexicon
στάδιον (G4712)
1 στάδιον , -ου, τό pl., στάδια ( Jo 6:19 , T), and metapl., στάδιοι (v. B1., § 9, 1), [in LXX: Da LXX 4:9 , Su 37 , II Mac 11:5 12:9 ff. * ;] a stadium , i.e. a measure of length = 600 Greek feet or 1⁄8 of a Roman mile Mt 14:24 (Rec., WH, txt., R, mg.), Lk 24:13 , Jo 6:19 11:18 , Re 14:20 21:16 , and, this being the length of the Olympic course, a race-course: I Co 9:24 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain