"Final vocabulary" is a term coined by Richard Rorty

Richard Rorty

Richard McKay Rorty was an American philosopher. He had a long and diverse academic career, including positions as Stuart Professor of Philosophy at Princeton, Kenan Professor of Humanities at the University of Virginia, and Professor of Comparative Literature at Stanford University...

 and explicated in Contingency, Irony, and Solidarity

Contingency, Irony, and Solidarity

Contingency, Irony, and Solidarity , is a book by American philosopher Richard Rorty, based on two sets of lectures he gave at University College, London, and at Trinity College, Cambridge....

. A "final vocabulary" is a set of communicative beliefs whose contingency is more or less ignored by the bearer. These beliefs can concern anything; it does not matter whether they are shared by the entire human race or are entirely unique. For an ironist

Ironist

Ironist is a term coined by Richard Rorty to describe someone who fulfills three conditions:In Contingency, Irony, and Solidarity, Rorty argues that Proust, Nietzsche, Foucault, Heidegger, Derrida, and Nabokov, among others, all exemplify Ironism to different extents.-References:*Rorty, Richard....

, a "final vocabulary" is always suspect.