IPA: /ɪnˈdɪkʃən/
KK: /ɪnˈdɪkʃən/
A period of 15 years that was used in ancient Rome and some medieval systems to measure time.
The historian noted the indiction of the events to understand the timeline better.
Indiction is derived from the Latin "indictio" (meaning a proclamation or announcement) which comes from "indictus" (meaning to declare or announce). The word refers to a formal announcement or declaration, particularly in a historical context regarding the assessment of taxes or the beginning of a new era.
Think of 'indictio' as a formal 'announcement' — that's why 'indiction' refers to a formal declaration.