This is the 923rd most frequent Icelandic word.
nótt
"Night."
The word 'nótt' is used to refer to the nighttime period, aligning with its usual role as a noun.
Ég átti góða nótt.
I had a good night.
Here, 'nóttin' is the definite form of 'nótt', referring to a specific night, emphasizing its grammatical inflection for definiteness.
Nóttin var köld og skýjuð.
The night was cold and cloudy.
In this sentence, 'nóttina' is the accusative form of the definite 'nótt', demonstrating noun declension in the accusative case.