This is the 1360th most frequent Catalan word.
coneguda
"Known" or "famous" (feminine form).
In this sentence, "coneguda" is used as a past participle adjective describing the attribute of Barcelona being 'known for its modernist architecture'. It agrees in gender (feminine) and number (singular) with "la ciutat" (the city).
La ciutat de Barcelona és coneguda per la seva arquitectura modernista.
The city of Barcelona is known for its modernist architecture.
Here, "coneguda" is a past participle used as an adjective to describe a feminine singular subject (a woman implicitly referenced) who is 'known among her friends'.
És coneguda entre els seus amics per ser molt amable i generosa.
She is known among her friends for being very kind and generous.
In this sentence, "coneguda" describes "la seva obra" (her work) and again functions as an adjective (feminine singular), indicating that her work is famous or recognized internationally for its uniqueness.