The kanji character 改 primarily conveys the idea of "change," "reform," "revise," or "correct." It implies making alterations, improvements, or updates to something. It suggests a shift from a previous state to a new and often better state. It can be applied to both tangible and abstract concepts.

・On-yomi (音読み): カイ (kai) ・Kun-yomi (訓読み): あらた(める) (aratame(ru)), あら(ためる) (ara(tameru))

⚫︎ 改善 (かいぜん) Translation: Improvement; betterment ⚫︎ 改正 (かいせい) Translation: Revision; amendment (e.g., of a law) ⚫︎ 改札口 (かいさつぐち) Translation: Ticket gate

The kanji 改 is a 形声文字 (keisei moji), a phono-semantic compound character. The left side is a radical related to action or movement, and the right side is 音 (on), which acts phonetically and might have originally indicated "cut." It originally meant "to cut and reshape" or "to carve," but later evolved to mean "to change" or "to reform." The character thus combines the idea of alteration with a phonetic element, reflecting the process of making something new.