ult

noun5

1. •
   (slang) An ultimate; the most powerful ability available to a character.

   • To me, Lucio is the pinnacle of what a support character should be, he's fast, he's fun, he's useful, he can get eliminations and his ult can change the course of a game. — 2016
2. •
   (slang) One's go-to best move for a kind of situation.
3. •
   The final (ultimate) syllable of a word.

   • Main stress falls on the antepenult, with secondary stress falling on the ult. — 2013
4. •
   One's ultimately favorite group or member, i.e. a preference which is never expected to change.
5. •
   (slang) A move that had critical success.

verb3

1. •
   (slang) To use a character's ultimate ability.
2. •
   (slang) To bring out one's go-to best move for a kind of situation.
3. •
   (slang) To make a move with critical success.

adverb1

1. •
   Abbreviation of ultimo (of last month).

   • your letter of the 21ˢᵗ ult.