quaternity

noun
qua·​ter·​ni·​ty | \kwə-ˈtər-nə-tē, kwä-\
plural quaternities

Definition of quaternity 

: a union of a group or set of four

First Known Use of quaternity

1529, in the meaning defined above

History and Etymology for quaternity

Late Latin quaternitas, from Latin quaterni four each

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The first known use of quaternity was in 1529

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