This is the 4706th most frequent Portuguese word.
documental
Related to documents or documentaries.
Here, 'documental' is used as an adjective describing the type of film, specifically a documentary.
Ele assistiu a um filme documental sobre a história do Brasil.
He watched a documentary film about the history of Brazil.
In this sentence, 'documental' is used to convey that the file holds value as a document or evidence.
Este arquivo tem valor documental, portanto, não pode ser descartado.
This file has documentary value, therefore, it cannot be discarded.
Here, 'documental' refers to the method of analysis involving documents.