Artificial intelligent assistant

triennal

triˈennal, a. and n. Obs. rare.
  Also 4 tri-, tryenal(e, -ennal(e, -el, trinel.
  [ad. med.L. triennāl-e (sc. officium), neuter of triennālis of three years: cf. F. triennal (16th c.).]
  A. adj. = triennial. rare—0.

1611 Cotgr., Triennal, triennall, of three yeares.

  B. n. A dispensation or indulgence for three years. (In 14th c. a disyllable = ˈtrīnal.)

1362 Langl. P. Pl. A. viii. 157 [I] diuinede þat Dowel Indulgence passede, Bienals and Trienals and Busschopes lettres. Ibid. 166 Bote trustene to Trienals [B. vii. 170 triennales; C. x. 330 triennels] treuly me þinkeþ Is not so syker for þe soule sertes, as do-wel. c 1380 Wyclif Sel. Wks. III. 400 Biggynge of beneficis, of indulgensis and trinels, pardouns, and veyne privilegies.

Oxford English Dictionary

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