A layer or stratum — one of several stacked or stratified levels (e.g., geological strata, layers in a cake or coating).
崖には色の違う複数の層がはっきり見える。
You can clearly see several layers of different colors on the cliff.
このケーキはクリームとスポンジの層が三つに分かれている。
This cake has three layers of cream and sponge.
塗装の層が厚くなると、修理が難しくなることがある。
When the coating layers become thick, repairs can become difficult.
A social or statistical stratum or bracket — a group or class sharing common characteristics (e.g., social class, age group).
調査は年齢層ごとに分析された。
The survey was analyzed by age group.
若者の層ではスマートフォンの利用率が高い。
The youth demographic has a high rate of smartphone use.
企業は上位層の顧客向けのサービスを拡充した。
The company expanded services aimed at its upper-tier customers.
In mathematics, a technical term meaning a 'sheaf' used in fields like algebraic geometry.
層の理論は代数幾何学で重要な役割を果たす。
Sheaf theory plays an important role in algebraic geometry.
Used to count stories/levels of a building (as in 'X-layered' or 'X-story'), e.g., 三層建て = three-storeyed.
この寺の塔は五層から成っている。
The temple's pagoda consists of five stories.
文書は三層構造になっていて、それぞれ役割が異なる。
The document has a three-layer structure, each with a different role.