改 means 'reform'

Animation / stroke order not available.
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Strokes : 7    Frequency: 421   JLPT: N2    Usefulness: 4    Study set: 4-2    Grade: 4   Intermediate lesson: 36    Beginner lesson: -   Begins 94 words   Used in 179 words   Used in 106 names   Not used as a component
Jōyō (常用)
   あらためる to reform   あらたまる to be renewed; to be formal
⿰   self   strike  
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In the most useful 10,000 words in Japanese, 改 is used 16 times, read 2 ways.
Across all words in Japanese, 改 is used 176 times, read 2 ways.
カイ : 154 words FIND ALL
1. betterment; improvement
2. kaizen (Japanese business philosophy of continuous improvement)  (often written カイゼン; often written with kana only)
(click the word for examples and links)
あらためる : 22 words FIND ALL
Most common form: 革める
ichidan verb, transitive verb
1. to change; to alter; to revise; to replace  (see also: 改まる; this meaning is restricted to form 改める, 革める)
2. to reform; to correct; to mend; to improve  (this meaning is restricted to form 改める, 革める)
(click the word to view an additional 2 meanings and 3 forms, examples and links)
An additional あらた.まる less common words include 改 but the reading has not yet been categorized.
Henshall: 458 (originally: 435)  Joy o' Kanji : 435  Key to Kanji: 100 

Cascading kanji view

カイ   あらためる to reform   あらたまる to be renewed; to be formal   
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ぼく strike   
コ   キ   おのれ self   
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