The kanji 固 primarily conveys the idea of "firm," "solid," "hard," or "fixed." It implies a state of being stable, unchanging, or resistant to change or external forces. This can apply to physical objects, abstract concepts, or even the resolve of a person.

・On-yomi (音読み): コ (ko) ・Kun-yomi (訓読み): かた(い) (katai)

⚫︎ 固定 (kotei) Translation: Fixed; to fix; to establish. ⚫︎ 固体 (kotai) Translation: Solid (state of matter). ⚫︎ 固い決意 (katai ketsui) Translation: Firm determination; resolute decision.

The kanji 固 is a phono-semantic compound (形声文字, けいせいもじ). The semantic component (meaning) is the radical 囗 (くにがまえ), which represents an enclosure or boundary, suggesting containment or something that is held together. The phonetic component (sound) is 古 (こ, ko), which contributes the sound of the character. The combination suggests something contained within a defined space, and therefore, strong or solid. The evolution of the character has remained relatively consistent over time.