This is the 4898th most frequent Catalan word.
transfronterera
Cross-border.
Here, 'transfronterera' is used as an adjective to describe 'col·laboració', indicating that the collaboration occurs between territories beyond a national border.
La col·laboració transfronterera entre països millora l'economia regional.
Cross-border collaboration between countries improves the regional economy.
In this sentence, the word 'transfronterer' qualifies 'comerç', showing that the trade involves transactions that cross a boundary between countries.
El comerç transfronterer es fa especialment intens durant certes èpoques de l'any.
Cross-border trade becomes particularly intense during certain times of the year.
Here, 'transfronterera' modifies 'seguretat', and it means that the security concerns pertain to areas or activities across neighboring countries.