The core meaning of the kanji 濃 is "thick," "dense," or "rich." It describes something that has a high concentration of a particular substance or quality. This can apply to liquids, colors, flavors, or even abstract concepts like the intensity of a feeling.

・On-yomi (音読み): ノウ (nou) ・Kun-yomi (訓読み): こ(い) (koi)

⚫︎ 濃いコーヒー (koi koohii) Translation: Strong coffee. ⚫︎ 濃厚な味 (nouna na aji) Translation: Rich/intense flavor. ⚫︎ 濃度 (noudou) Translation: Concentration (e.g., of a solution).

The kanji 濃 is a phono-semantic compound. It is composed of the radical 水 (mizu), meaning "water," and the phonetic component 農 (nou), which suggests the sound and originally related to farming. The combination suggests something related to the concentration of liquid as in irrigation water, or the richness as in the harvest from the farm. It is a simplification and visual representation of the concept of density or concentration.