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In mathematical fractions, what is the correct and proper term (in British English in case of more variants) for the horizontal division line between the numerator and the denominator?

What I find in dictionaries is

Fraction line
Stroke
Fraction stroke

None of these appear in the Oxford Lexico dictionary, though, so I am in doubt. Which is a proper term that is used in English-speaking schools?

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In a fraction where the numerator is above a horizontal line, and the denominator below it, the horizontal line is usually called a fraction bar or, occasionally, a vinculum.

Division

  • Be wary of using vinculum, though, as it is more typically used to refer to an over- or underline (for example, in repeating decimals). – Maciej Stachowski Aug 5 at 13:01

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