1. to make or become thin, less dense, or more refined
Usage: often used in scientific contexts
2. to purify or make more spiritual or elevated
Usage: formal

Examples

• The air begins to rarify at high altitudes.
• Heat will rarify the gas in the container.
• The philosopher sought to rarify his thoughts through meditation.
• Mountain climbers must adjust to rarefied air.
• The artist’s work seemed to rarify over the years.
• Extreme cold can rarify certain materials.