A measurement is repeatable if the original experimenter repeats the investigation using same method and equipment and obtains the same results.
N.B. "the same" results implies identical, but in reality "the same" means that random error will still be present in the results.
This is quite hard to get your head round, given the definition above! Think about results that are not repeatable - one set of data will be very different to another, not just slightly different.