This is the 10515th most frequent Catalan word.
provinguin
"Provinguin" is the third-person plural present subjunctive form of the verb "provenir," meaning "they come from" or "they originate."
Here, 'provinguin' is used in a subjunctive form to refer to books that originate from (come from) the library.
Els llibres que provinguin de la biblioteca han d'estar etiquetats.
The books that come from the library must be labeled.
In this sentence, 'provinguin' is used in a nominal clause to denote a requirement for the origin of the documents being from reliable sources (subjunctive mood).
És important que els documents provinguin de fonts fiables.
It is important that the documents come from reliable sources.
'Provinguin' is featured as a descriptive feature for reports, indicating their source being specific departments. This usage asserts a condition or expectation (subjunctive third-person plural).