No. 163 in Icelandic
einu
The Icelandic word "einu" is the dative singular or accusative singular definite form of "einn," meaning "the one" or "the only" depending on context.
In a sentence
Ég kom í hitt eina húsið sem er gult á götunni.
I went to visit the one house that is yellow on the street.
In this sentence, 'einu' is a form of the word 'einn', meaning 'one', and here it participates in describing a unique entity.
Við erum einu sinni komin hingað áður.
We have been here only once before.
Here, 'einu' is part of the phrase 'einu sinni', meaning 'once', used as an indicator of frequency.
Hún sagði mér einu sinni um það sem gerðist.
She told me once about what happened.
Here, 'einu' is again used within 'einu sinni', acting as a temporal adverb denoting a single occurrence.
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