1. the action or process of reforming or being reformed
2. a 16th-century movement for the reform of abuses in the Roman Catholic Church ending in the establishment of the Reformed and Protestant Churches
Usage: historical; often capitalized

Examples

• The reformation of the prison system took several years to complete.
• His personal reformation began after he left his old job.
• The Reformation changed the religious landscape of Europe forever.
• Martin Luther played a key role in the Protestant Reformation.
• The company underwent a complete reformation of its policies.
• Educational reformation is needed to address modern challenges.
• The Reformation began in Germany in the early 1500s.