decider

Etymology

decide + -er

noun

1. (of a controversy, question, etc) A person, divinity, or authoritative text which decides.
   This written and revealed will of God I said was the Judge and Decider of all Questions. 1667, anon., "George Fox digg'd out of his burrowes, or An offer of disputation on fourteen proposalls...". John Foster, Boston, pp. 89-90
   The Determination of his Majesty, who is the only proper decider of this Matter. 1758, Aaron Leaming, Jacob Spicer, The grants, concessions, and original constitutions of the province of New-Jersey, Philadelphia, page 680
   The god Adar, which, with its two oft-occurring idiographs Bar and Nin-ib, is preferably designated as the "Decider" (Entschneider). 1885, Friedrich Delitzsch, "General Notes: The Religion of the Kassites," Hebraica, vol 1 no 3 (Jan), p. 190
   Although the decider may know any of the principles in the sequence, he cannot know every such principle. 15 Mar 1967, David P. Gauthier, “How Decisions are Caused”, in The Journal of Philosophy, volume 64, number 5, page 151
   I have strong confidence in Don Rumsfeld. I hear the voices. And I read the front page. And I know the speculation. But I'm the decider and I decide what is best. 2006-04-18, George W. Bush, quotee, “President Bush Announces Appointment of New Budget Director”, in Washington Post, →ISSN, archived from the original on 2018-06-28
   As noted, the frontal cortex is central to executive function. To quote George W. Bush, within the frontal cortex, it's the PFC that is “the decider.” 2017, Robert Sapolsky, chapter 2, in Behave, Penguin
2. (chiefly Britain, Australia, sports) An event or action which decides the outcome of a contested matter.
   Four years on, France […] will meet Ireland again in the probable decider for their World Cup pool in September 21 in Paris. 2007-02-10, William Fotheringham, “France aim to end four years of regret with seven-week sacrifice”, in The Guardian, →ISSN
   […] when the Welshman laid on the 74th-minute decider. 2007-02-22, Kevin McCarra, “Liverpool show of unity recalls old magic”, in The Guardian, →ISSN
   Tensions threatened to boil over before the defending champion Gerwyn Price eventually overcame Kim Huybrechts in a sudden-death decider to reach the last 16 of the PDC World Championship. 2021-12-27, “Gerwyn Price beats Kim Huybrechts in fiery clash to keep title defence alive”, in The Guardian, →ISSN
3. (computer science) A Turing machine that halts regardless of its input.