quaternity

From quatern +‎ -ity, from Latin quaternitās, from quaternus (“fourfold, in fours”).

• IPA^(key): /kwəˈtɜː(ɹ)nɪti/

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quaternity (countable and uncountable, plural quaternities)

1. (countable) A group or set of four.
2. (uncountable) The state of being four.

• (a group of four): quartet, tetrad; see also Thesaurus:quartet
• (state of being four): fourness; see also Thesaurus:fourness

• quaternary
• unity (oneness)
• duality (twoness)
• trinity (threeness)
• quinity (fiveness)