a. and sb. [f. TRI- + L. centenni-um a space of a hundred years + -AL: cf. prec.] = TERCENTENNIAL.

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1818.  Morn. Chron., 14 May, 2/1. On the evening of the Tricentennial Anniversary of the Glorious Reformation … a number of young men had assembled, and after serious meditation on what Luther, Calvin, &c. had done for the Reformation they unanimously resolved to subscribe their mite to the Irish Evangelical Society.

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1882–3.  Schaff’s Encycl. Relig. Knowl., II. 1051/2. The great national Luther tri-centennial of 1817.

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1893.  Cycl. Rev. Current Hist. (U.S.), III. 311. The tricentennial exercises were held in the exposition building.

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