umpteenthEnglishOxford New American Dictionaryumpteenth /ˌəm(p)ˈtēnTH, ˌəm(p)ˈtinθ / ▸ ordinal number informal used to emphasize that something has happened on many other occasions: she checked her watch for the umpteenth time Totti swung his umpteenth corner into Scotland's box.