quarter-century

A period of twenty-five years.

Japanese Meaning

四半世紀 / 25年間の期間 / 二十五年

After a quarter-century of research, the team finally published definitive results.

四半世紀の研究の末に、チームはついに決定的な結果を発表した。

Sense（1）

A period of twenty-five years.

I spent my second quarter-century

Losing what I had learnt at university

And refusing to take in what had happened since […]

quarter-centuries

（ plural ）