This is the 1139th most frequent Japanese word.
一層
"一層" means "more," "still more," or "further."
Here, '一層' means 'even more' or 'further more' to denote an increase in effort or intensity.
彼は一層努力しました。
He made even greater effort.
In this sentence, '一層' indicates an enhancement or progression in comprehension.
この本を読むと一層理解が深まる。
Reading this book deepens understanding even further.
Here, '一層' is used to signify an additional degree or layer of change.