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(index ka)

Finnish cardinal numbers
 <  7 8 9  > 
    Cardinal : kahdeksan
    Ordinal : kahdeksas
    Adverbial : kahdeksasti
    Multiplier : kahdeksankertainen
    Colloquial counting form : kasi
    Colloquial ordinal : kakki
Finnish Wikipedia article on kahdeksan


From Proto-Finnic *kakteksa, i.e *kakt-e-ksa, consisting of an earlier form of kaksi + a form of the negation verb ei + ksa, which has the same origin as the endings in the reflexive forms found in dialects, c.f. Kalevala forms such as istuikse = istuutuu (he/she sits), so that the combination means "two are not there", and "of ten" was implied or originally said. Compare yhdeksän (nine), which developed the same way.

The original nominative kahdeksa was replaced by the genitive due to kymmen ending in -n (which is also the genitive ending), but is attested in older texts, particularly in compounds.


  • IPA(key): /ˈkɑhdeksɑn/, [ˈkɑxde̞ks̠ɑn]
  • Rhymes: -ɑhdeksɑn
  • Syllabification: kah‧dek‧san



  1. eight

Usage notes[edit]


Declension is the same as type koira (number 10), except of the nominative singular form (*), where an -n is added at the end.


See also[edit]