decider
/dɪˈsaɪdə(ɹ)/ noun C2- A person, divinity, or authoritative text which decides.
- A Turing machine that halts regardless of its input.
Plural deciders
Learn decider in real texts
With a free account, hover any word in the library for its meaning, hear it read aloud, save words for review timed to your memory, and see how much of each book you already know.