This is the 10593rd most frequent Catalan word.
rar
Rare, unusual, strange.
In this sentence, 'rar' means 'rare,' indicating that the book is unusual or uncommon.
Aquest llibre és molt rar i difícil de trobar.
This book is very rare and hard to find.
Here, 'rar' is used to denote that something is unusual in terms of occurrence or probability.
És rar que plogui tant en aquesta època de l'any.
It is rare for it to rain so much during this time of year.
In this case, 'rara,' the feminine form of 'rar,' is describing something peculiar or odd about the manner of dressing.