record-breaking

record-breaking (not comparable)

1. Of an achievement or observation, exceeding the highest previously recorded level in that activity or category.
   • 1944 September and October, “A Busy Month”, in Railway Magazine, page 259:

     The peak of the record-breaking month came during the fourth week, when the railways were called upon to handle the transport side of the official evacuation from the London area.

   • 2020 July 29, Ian Prosser discusses with Paul Stephen, “Rail needs robust and strategic plans”, in RAIL, page 42:

     For example, record-breaking rainfall in the UK made February 2020 the wettest February on record, while July 2019 was deemed to be the warmest month on record worldwide.

   Synonyms: record-setting, (attributive) record