Definition of "decider"

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.

1967 March 15, 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 April 18, George W. Bush, quotee, “President Bush Announces Appointment of New Budget Director”, in Washington Post‎, 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

Four years on, France […] will meet Ireland again in the probable decider for their World Cup pool in September 21 in Paris.

2007 February 10, William Fotheringham, “France aim to end four years of regret with seven-week sacrifice”, in The Guardian‎

[…] when the Welshman laid on the 74th-minute decider.

2007 February 22, Kevin McCarra, “Liverpool show of unity recalls old magic”, in The Guardian‎

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 December 27, “Gerwyn Price beats Kim Huybrechts in fiery clash to keep title defence alive”, in The Guardian‎