vinculum

noun
vin·cu·lum | \ ˈviŋ-kyə-ləm \
plural vinculums or vincula\ˈviŋ-kyə-lə \

Definition of vinculum 

1 : a unifying bond : link, tie

2 : a straight horizontal mark placed over two or more members of a compound mathematical expression and equivalent to parentheses or brackets about them

Illustration of vinculum

Illustration of vinculum

vinculum 2

First Known Use of vinculum

1661, in the meaning defined at sense 1

History and Etymology for vinculum

Latin, from vincire to bind

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The first known use of vinculum was in 1661

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occurring twice a year or every two years

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