1. a person who gives advice or guidance, especially professionally
Usage: also spelled counselor in American English
2. a person who supervises children at a summer camp
3. a lawyer who gives legal advice
Usage: formal; British English

Examples

• The school counsellor helped students choose their college courses.
• She works as a marriage counsellor for couples having relationship problems.
• The camp counsellor organized games for the children.
• My guidance counsellor suggested I apply for scholarships.
• He met with a financial counsellor to discuss his debt.
• The counsellor listened carefully to her concerns about anxiety.
• Each cabin at summer camp has two counsellors to supervise the kids.