This is the 592nd most frequent Polish word.
wiatr
"Wiatr" means "wind" in English.
Here, 'wiatr' indicates the natural phenomenon of wind.
Wiatr wieje dzisiaj bardzo mocno.
The wind is blowing very strongly today.
In this context, 'wiatr' is used metaphorically to describe speed and agility.
Przyjechał na białym koniu jak wiatr.
He arrived on a white horse like the wind.
The phrase 'rzucać słów na wiatr' is an idiomatic expression meaning 'to say things without responsibility.'