This is the 3065th most frequent Catalan word.
missiva
A missive or formal letter.
The word 'missiva' refers to a formal or written communication (a letter) here.
Vaig enviar una missiva al meu amic explicant-li la situació.
I sent a missive to my friend explaining the situation.
In this context, 'missiva' is used to mean a written document bearing information.
La missiva que vaig rebre estava plena de bones notícies.
The missive I received was full of good news.
Here, 'missiva' emphasizes the medium through which the message was delivered—written form.