[in.dic.tion] n [ME indiccioun, fr. LL indiction-, indictio, fr. L, proclamation, fr. indicere to proclaim, fr. in- + dicere to say--more at diction] (14c): a 15-year cycle used as a chronological unit in several ancient and medieval systems
INDICTION
Meaning of INDICTION in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012