from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A 15-year cycle used as a chronological unit in ancient Rome and incorporated in some medieval systems.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A fiscal period of fifteen years, instituted by Constantine in 313 CE (but counting from 1st September 312), used throughout the Middle Ages as a way of dating events, documents etc.
  • n. A declaration or official announcement.
  • n. The decree made by Roman Emperors which fixed the property tax for the next fifteen years.

from the GNU version of the Collaborative International Dictionary of English

  • n. Declaration; proclamation; public notice or appointment.
  • n. A cycle of fifteen years.

from The Century Dictionary and Cyclopedia

  • n. A declaration; proclamation.
  • n. A fiscal period of fifteen years, established by Constantine the Great after the reorganization of the Roman Empire, being the term during which the annual tax on real property was paid on the basis of a valuation made and proclaimed at the beginning of each quindecennial period. This became a common and convenient means for dating ordinary transactions.
  • n. Hence In chronology, a year bearing a number, or the number attached to the year, showing its place in a cycle of fifteen years, counting from a. d. 313.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a 15-year cycle used as a chronological unit in ancient Rome and adopted in some medieval kingdoms


Middle English indiccioun, from Late Latin indictiō, indictiōn-, proclamation, period of 15 years, from Latin indictus, past participle of indīcere, to proclaim : in-, intensive pref.; see in-2 + dīcere, to say; see deik- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Old French indiction or its source, Latin indictiōnem, accusative singular of indictiō, from indicere, present active infinitive of indicō. (Wiktionary)



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