Quaternity
Pronunciation : Qua*ter"ni*ty
Part of Speech : n.
Etymology : [LL.quaternitas, fr. L. quaterni four each: cf. F. quaternit?.]
Definition : 1. The number four. [Obs.] Sir T. Browne.
2. The union of four in one, as of four persons; -- analogous to the theological term trinity.
Source : Webster's Unabridged Dictionary, 1913