Other forms: finales
A finale is the last and biggest movement of a musical work. The grand finale, a rousing finale, the finale of the symphony.
In a symphony or a concerto it is the closing movement, and it is usually the fastest and loudest. The grand finale is the whole show's climax, in a concert or a firework display. In television, the season finale and the series finale are the last episodes, and the series finale carries the weight of everything before it. Note the pronunciation, fin-AH-lee; and that final and finale are the same word with different endings.
Italian finale means ending, from Latin finis, an end — the same root as finish, finite and define. Musical terms in English are almost all Italian, and this one arrived with the symphony itself.
Latin
fīnālis
Italian
finale — ending
English, today
finale
From Italian finale (“ending”), from Latin fīnālis, from Latin fīnis (“end; boundary, limit”). a doublet of final.
Etymology from Wiktionary, CC BY-SA