adv. [f. TRIENNIAL a. + -LY2.] Every three years; once in three years.

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1689.  in 6th Coll. Papers rel. Pres. Juncture, 25. The Parliament to be chosen Triennially, and to meet Annually.

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1727.  Bailey, vol. II., Triennially.

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1806.  W. Taylor, in Ann. Rev., IV. 714. It appears that the tithe ought to be levied triennially.

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1881.  Chamb. Jrnl., No. 914. 419/1. The gorgeous festival given … triennially at the Crystal Palace.

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