Old Norse

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Old Norse numbers (edit)
[a], [b] ←  17 18 19  → 
    Cardinal: átján, (older form) áttján
    Ordinal: átjándi, (older form) áttjándi

Etymology

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From Proto-Germanic *ahtōutehun. Compare Old English eahtatīene, Old High German ahtozehan.

Numeral

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áttján

  1. (cardinal number, older form) Alternative form of átján: eighteen

References

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