This is the 7965th most frequent Polish word.
młoda
"Young" (feminine form).
Here, 'młoda' is used as an adjective to describe the girl, indicating her youth.
Młoda dziewczyna spaceruje po parku.
The young girl is walking in the park.
In this sentence, 'młoda' is again an adjective, specifying the youth of the pianist.
Chciałbym poznać młodą pianistkę, która grała na koncercie.
I'd like to meet the young pianist who played at the concert.
Here, 'młoda' describes wine, suggesting that it is youthful or immature in brewing.