This is the 10345th most frequent Catalan word.
portuguesos
"Portuguesos" means "Portuguese" (plural, referring to people from Portugal).
In this case, 'portugueses', a related form, acts as an adjective describing the traditions.
Aquest llibre explica les tradicions portugueses.
This book explains Portuguese traditions.
Here, 'portuguesos' is used as a noun referring collectively to the people of Portugal.
Els portuguesos són coneguts per les seves sardines delicioses.
The Portuguese are known for their delicious sardines.
In this sentence, 'portuguesos' is used as a plural noun indicating a group of individuals from Portugal.