This is the 70th most frequent Ukrainian word.
сьогодні
"Today."
The word "сьогодні" is used as an adverb referring to the current day.
Сьогодні сонячна погода.
Today is sunny weather.
Here, "сьогодні" emphasizes the specific day when the action occurred.
Я сьогодні зустрів свого друга на вулиці.
I met my friend on the street today.
In this sentence, "сьогодні" specifies when the planned activity will take place.