åtminstonde

Ordhistoria och etymologi

From a confusion of the originally dative ending one and the numeral affix -onde, which is a much more common ending than -one. -onde is found in some ordinal numbers such as åttonde (“eighth”), nionde (“ninth”), tionde (“tenth”) and tjugonde (“twentieth”). There are also -ande and -ende, the Swedish equivalents of English -ing, both with the d before the last vowel which also makes it seem natural to pronounce it in this word, which actually lacks it, as well. -one appears in modern language only in two other terms: på sistone, i förstone, of which the latter is somewhat dated.