a stade: the standard Greek unit of long distance, six hundred Greek feet, so roughly two hundred yards or an eighth of a Roman mile.
The Greek world measured travel by the length of its running track. One stade ran six hundred Greek feet, close to two hundred yards or a little under a fifth of a mile, and about an eighth of the Roman mile that the empire stamped on its roads. So when a New Testament writer tells you how far apart two things are, he is counting racetracks laid end to end.
The counts follow a steady pattern:
- the figure is usually rounded, as with a boat that had rowed about twenty five or thirty of them
- the distance is measured out from a fixed landmark, so many stades from the shore or from Jerusalem
- in Revelation the numbers run into the thousands, far past anything a traveler would pace off
That last point is why the two senses below are worth keeping apart. Most of the time the word answers how far one place lies from another, a plain traveler's figure that a first reader could check against a familiar road. In Revelation it instead measures the size of a thing, the reach of a river of blood or the length, width, and height of a city, and there the round numbers may be carrying meaning of their own rather than simply reporting a measurement.