From Longman Dictionary of Contemporary Englishrecord-breakingˈrecord-ˌbreaking adjective [only before noun] BESTa record-breaking number, level, performance, or person is the highest, lowest, biggest, best etc of its type that has ever happened or existed his record-breaking flight across the Atlantic —record-breaker noun [countable]
Examples from the Corpus
record-breaking• And today we can reveal the staggering total of your generous donations so far - a record-breaking £300,000.• All nine preview shows are sold out, a record-breaking accomplishment for the Tiffany Theaters in West Hollywood.• A record-breaking five hundred thousand people attended the festival.• The 1990s have been characterized by record-breaking growth in most wireless segments, including cellular, paging, and specialized mobile radio.• It was record-breaking heat for this date.• record-breaking heat• a record-breaking run• a record-breaking swimmer• Record-breaking temperatures are being forecast for the weekend.From Longman Business Dictionaryrecord-breakingˈrecord-ˌbreaking adjective [only before a noun] higher, faster etc than has ever happened or been done beforeThe company announced record-breaking profits. 