A belief system, movement, or ideology centered on the significance of 100-year periods or the achievement of living 100 years.
From 'centenarian' + '-ism' (a system or ideology). This is a less common term created by adding the suffix for doctrines or belief systems to the word for a 100-year-old person.
Some cultures genuinely treat reaching 100 as a spiritual milestone or rebirth—the Japanese kanreki celebrates 60 years as a 'return to birth,' suggesting that cultures measure human life in different numerological systems beyond just age.
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