noun, plural quaternities.
a group or set of four.

1520–30; < Late Latin quaternitās, equivalent to Latin quatern(ī) four each, four at a time + -itās -ity

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World English Dictionary
quaternity (kwəˈtɜːnɪtɪ)
n , pl -ties
a group of four, esp a concept of God as consisting of four persons
[C16: from Late Latin quaternitās, from Latin quaternī by fours; see quaternary]

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