halfer

The English word “halfer” has 3 meanings listed here.

noun

With regard to the Sleeping Beauty problem: one who argues that the probability of heads is 1/2.
One who possesses or gives half only; one who shares.
A gelded male fallow deer.

From half + -er.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.