1. existing only in small numbers; uncommon or exclusive
Usage: often refers to elite social circles or specialized fields
2. having less density, especially of air at high altitudes
Usage: technical or scientific contexts

Examples

• She moved in the rarified circles of international diplomacy.
• The rarified atmosphere of the academic conference intimidated new researchers.
• At high altitudes, climbers must adjust to the rarified air.
• His taste in art was considered too rarified for popular appeal.
• The rarified world of classical music has few young enthusiasts.
• Pilots train to handle aircraft performance in rarified atmospheric conditions.