1. the quality or state of being limited to a single person or group; the condition of not being shared with others
2. the quality of being expensive, fashionable, or prestigious and therefore available only to a select few

Examples

• The exclusiveness of the club made membership highly desirable.
• She valued the exclusiveness of owning a rare first edition.
• The brand's exclusiveness appeals to wealthy consumers.
• The exclusiveness of the neighborhood kept property values high.
• He appreciated the exclusiveness of having a private beach.
• The exclusiveness of the invitation-only event created buzz.
• The exclusiveness of their friendship meant they spent most time together.