This is the 237th most frequent Czech word.
noci
"Noci" in Czech means "of the night" or "nights" (genitive singular or nominative/accusative plural of "noc").
Here, 'noci' is used in the instrumental case, denoting 'during the night.'
Každou noci vidím jasné hvězdy na obloze.
Every night I see bright stars in the sky.
In this usage, 'noci' appears in the genitive case, indicating possession or description of 'night.'
Vzpomínal jsem na naše setkání té zimní noci.
I was reminiscing about our meeting that winter night.
The word 'noci' in this context is in the genitive case, functioning descriptively, attached to 'silent.'