一増一減 いちぞういちげん Meanings Noun 16,800,000-year period over which a human lifespan increases from ten years to 84,000 years (by one year per century) and then decreases back to ten (by one year per century) Kanji 一 one. Read as イチ. 増 increase. Read as ゾウ. 減 decrease. Read as ゲン. Word lists Buddhism Jinuma: Japanese Dictionary · Word lists