This is the 2061st most frequent Russian word.
дня
The Russian word "дня" means "of the day" (genitive case of "день").
In this sentence, 'день' is in the nominative case, referring to the subject of the day being described as wonderful.
Сегодня прекрасный день для встречи.
Today is a wonderful day for a meeting.
Here, 'дня' is in the genitive case, which is used to indicate possession or a period of time within the day.
Это произошло в течение дня.
It happened during the day.
In this example, 'дня' is in the genitive case after the preposition 'до', which indicates the end point of a time period.