This is the 74th most frequent Finnish word.
tänään
"Today"
In this sentence, 'tänään' is used to specify the current day when describing it as beautiful.
Tänään on kaunis päivä.
Today is a beautiful day.
In this example, 'tänään' introduces the specific day on which the special dinner event is happening, emphasizing the timing of the event.
Tänään meillä on erityinen illallinen.
Today we have a special dinner.
Here, 'tänään' serves to indicate that the planned event of going shopping is occurring on the present day, complementing and specifying the time phrase 'this afternoon'.