Boy actors naked. Definition of boy noun in Oxford Advanced Learner's Dictionary. an…. BOY definition: 1. See examples of BOY used in a sentence. [1] The meaning of BOY is a male child from birth to adulthood. 3. A boy is a child who will grow up to be a man. The term is commonly used for a child or an adolescent. It is not until they reach puberty (adolescence) that their bodies start to mature and they become a man. a male who is from or native to a given place: He's a country boy. qpcezz3m4xsgcqmn9xlx37qrsa44rbvwfgshkndg1k