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Entry 2 senses Webster, 1913

Quaternity

· Qua·ter·ni·ty · IPA /kwəˈtɜː(ɹ)nɪti/
01 n. The number four.
  1. 1.
    The number four.[Obs.]
  2. 2.
    The union of four in one, as of four persons; -- analogous to the theological term trinity.