全盛 (zensei) Japanese meaning: height of prosperity | Kotomora。
His heyday has already passed.
This town reached its peak of prosperity in the Edo period.
Usage patterns
全盛を極めるto reach the height of prosperity or dominance
This company reached the height of its prosperity at one point.
〈人〉が全盛を誇るfor someone to boast dominance during their peak
He was at the height of his dominance in the baseball world during that era.
〈人〉の全盛期someone's heyday or prime
In his prime, he never lost to anyone.
