| anorexia nervosa | Eating disorder that involves the relentless pursuit of thinness through starvation
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| bulimia nervosa | Eating disorder in which the individual consistently follows a binge-and-purge pattern
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| hormones | Powerful chemical substances secreted by the endocrine glands and carried through the body by the bloodstream
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| hypothetical-deductive reasoning | Piaget's formal operational concept that adolescents have the cognitive ability to develop hypotheses, or best guesses, about ways to solve problems
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| imaginary audience | Part of adolescent egocentrism in which adolescents believe that others are as interested in them as they themselves are. Includes attempts to be noticed and visible
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| personal fable | Part of adolescent egocentrism that involves an adolescent's sense of uniqueness and invincibility
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| puberty | Period of rapid skeletal and sexual maturation that occurs mainly during early adolescence
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| service learning | Form of education that promotes social responsibility and service to the community
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| top-dog phenomenon | The circumstance of moving from the top position in elementary school to the lowest position in middle or junior high school
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