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.
- Hyphenation: kah‧dek‧san
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| Cardinal : kahdeksan
Ordinal : kahdeksas
Adverbial : kahdeksasti
Multiplier : kahdeksankertainen
|Finnish Wikipedia article on kahdeksan|
Declension of kahdeksan (type koira)
Declension is the same as type koira (number 10), except of the nominative singular form (*), where an -n is added at the end.