An adverb meaning 'even more' or 'all the more' to indicate an increased degree or amount compared to before.
彼の説明で、問題がより一層明確になった。
His explanation made the problem even clearer.
この状況では、より一層の注意が必要だ。
In this situation, even greater caution is necessary.
努力を重ね、より一層成績が伸びた。
With continued effort, his grades improved even more.
台風が近づき、風がより一層強くなった。
The typhoon approached and the wind grew even stronger.
Used nominally (e.g., 'より一層の〜') to indicate an increased degree or a greater level compared with before.
より一層のご協力をお願い申し上げます。
We ask for your even greater cooperation.
会社はより一層の品質改善を約束した。
The company promised further improvements in quality.