1. a person or thing that engages; one who enters into an agreement or commitment
Usage: formal or technical usage
2. a person who attracts and holds the attention or interest of others
Usage: informal

Examples

• The engager of the contract must sign all required documents.
• She is a natural engager who can hold an audience's attention for hours.
• The speaker was an excellent engager, keeping the audience interested throughout the presentation.
• As an engager in community service, he volunteered regularly.
• The engager of the employees ensured they felt valued and motivated.