1. Someone who charges, binds, or commands earnestly and solemnly, often under oath or the threat of a penalty: The adjurer required the young man to do voluntary work at the service center for a period of 8 months instead of having him go to jail.
2. A person who entreats or requests earnestly or solemnly: As an adjurer, Mr. Hathaway strongly urged the editor to stop including silly articles in the newspaper.