thousand years; many years; a very long time
Often used in poetic or formal contexts to express an extremely long period, or in set phrases like 千秋楽 (final day of a sumo tournament or theatrical run).
I composed this poem with feelings spanning a thousand years.
The final performance of the run was deeply moving.
final performance; closing day; last show · final day of a sumo tournament
waiting impatiently; each moment feeling like an eternity
From Middle Chinese 千秋 (tshen tshjuw), literally 'thousand autumns,' where autumns poetically stand for years.