1A method for counting or reckoning years; a calendar; specifically the 365-day solar calendar used in pre-Columbian Mesoamerican cultures for civil purposes, in combination with a 260-day ritual calendar (now historical).
2With reference to the practices of North American Indians, especially Plains Indians: a pictorial record or chronicle usually consisting of pictograms depicting the main event or events of each year, painted on an animal hide, piece of cloth, etc.
year count/ˈjɪə ˌkaʊnt/ /ˈjəː ˌkaʊnt/
Late 19th century. From year + count.