: being, relating to, or involving statistical methods that assign probabilities or distributions to events (such as rain tomorrow) or parameters (such as a population mean) based on experience or best guesses before experimentation and data collection and that apply Bayes' theorem to revise the probabilities and distributions after obtaining experimental data

Examples of Bayesian in a Sentence

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The researchers collaborated with a team in South Korea, and applied what's known as the multi-objective Bayesian optimization machine learning algorithm. New Atlas, 21 Feb. 2025 The sampling precision of Harris online polls is measured by using a Bayesian credible interval. Russell Contreras, Axios, 20 Jan. 2025

Word History

First Known Use

1950, in the meaning defined above

Time Traveler
The first known use of Bayesian was in 1950

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Cite this Entry

“Bayesian.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Bayesian. Accessed 27 Mar. 2025.

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