This is the 98th most frequent Lithuanian word.
dienos
The Lithuanian word "dienos" means "day's" or "days" in English, depending on context.
Here, 'diena' is used in nominative singular form to denote a day.
Šiandien yra graži diena.
Today is a beautiful day.
In this sentence, 'dienos' is used in its plural form in the nominative case to refer to multiple days.
Man patinka ilgesnės dienos pavasarį.
I like longer days in spring.
The word 'dieną' here is the accusative singular form of 'diena', used as the object of the verb 'praleidau' (spent).