adverb
even more; still more; all the more
Adverb expressing an increase in degree compared with before or with another situation. Often has a slightly written or polished feel compared with もっと.
雨で道が一層滑りやすくなった。
The rain made the road even more slippery.
彼女
Her explanation made the problem still clearer.
noun
one layer; a single layer
Literal noun use referring to one layer or stratum of something. Commonly appears in technical or descriptive contexts involving coatings, materials, or structure.
このフィルムは、一層の樹脂で表面を保護している。
This film protects the surface with a single layer of resin.
noun
lowest floor; first level of a building
Specialized building or architectural use for the lowest level of a structure; everyday Japanese more often says 一階.
この建物は、一層を店舗、二層を住宅として計画された。
The building was planned with shops on the lowest level and residences on the second level.
adverb
Obsolete adverbial use close to modern いっそ, as in 'rather' or 'might as well.' Do not use this meaning in ordinary modern Japanese.
See also: いっそ
古い文章では、「一層ここで別れよう」の一層が、今の「いっそ」に近い意味になる。
In older writing, the 一層 in 'rather, let us part here' has a meaning close to modern いっそ.