Final Fantasy (term)

The Final Fantasy series has sometimes had its own title alluded to or used as a term by characters within its fictional universes.

Final Fantasy VIII
The speech Ultimecia holds in Deling City was almost completely different in the Japanese version of the game, where she mentions the words "final fantasy". The original speech can be read here.

Final Fantasy XII
Gilgamesh's special attack is called Ultimate Illusion), a synonym for Final Fantasy.

Final Fantasy Tactics Advance
Mewt create an illusory version of Ivalice using a Gran Grimoire and a game referred to as Final Fantasy. Marche mentions that this Final Fantasy is a computer game, instead of any consoles that supports the real games (although this is technically correct, as by definition, all consoles are purpose-built computers). It is unknown which Final Fantasy installment they are referring to, although it is possibly Final Fantasy XII.

Dissidia Final Fantasy
The final part of Inward Chaos is titled The Ultimate Fantasy. Additionally, the final blow of Chaos's Utter Chaos attack is called Brink of Delusion. Both are synonyms for Final Fantasy.