Definition of counsellor noun from the Oxford Advanced Learner's Dictionary

counsellor

noun (especially US counselor)
ˈkaʊnsələ(r)
 
; ˈkaʊnsələr
 
 
1 a person who has been trained to advise people with problems, especially personal problemsa marriage guidance counsellor2 (North American English, Irish English) a lawyer3 (North American English) a person who is in charge of young people at a summer camp