Indiction

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INDICTION, computation of time. An indiction contained a space of fifteen years.
     2. It was used in dating at Rome and in England. It began at the dismission of the Nicene council, A. D. 312. The first year was reckoned the first of the first indiction, the second, the third, &c., till fifteen years afterwards. The sixteenth year was the first year of the second indiction, the thirty-first year was the first year of the third indiction, &c.