This is the 17255th most frequent Polish word.
zakochana
"Zakochana" means "in love" (referring to a woman).
Here, 'zakochana' is used as a nominative adjective agreeing with 'Maria.' It indicates love or affection.
Maria jest zakochana w Piotrze.
Maria is in love with Piotr.
In this sentence, 'zakochana' modifies the noun 'para' as an adjective to describe the couple.
Zakochana para trzymała się za ręce.
The couple in love held hands.
Here, 'zakochana' is part of 'jest/ była zakochana w,' with a dative complement, indicating affection or enchantment.