It is to my understanding that ordinal numbers are constructed with a -a prefix.

First - 1st - unua
Second - 2nd - dua
Tenth - 10th - deka

Based on this, would "eleventh" be deka unua or dek unua?

Thanks in advance.

1 Answer 1


The -a is only added to the last word so your example would be dek unua.

It’s also quite common to write the ordinal numbers as a single word such as dek-unua. Apparently neither way is more official because the Fundamento itself uses both so it is a matter of preference. Personally I quite like it as one word.

PMEG has much more detail on this.

  • 1
    I guess you meant ordinal numbers
    – marcus
    Commented Mar 29, 2019 at 4:22
  • @marcus, yes, I did. Thanks, I’ve edited it.
    – Neil Roberts
    Commented Mar 29, 2019 at 9:34

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