Morris Rosenberg
Self-esteem is stable sense of personal worth or worthiness.
Self-esteem is the favorable or unfavorable attitude toward the self.
Nathaniel Branden
Self-esteem is the experience of being competent to cope with the basic challenges of life and being worthy of happiness.
Children’s Health Encyclopedia
Self-esteem is the way individuals perceive themselves and their self-value.
Self-esteem is the way individuals think and feel about themselves, and how well they do things that are important to them.
Britannica Concise Encyclopedia
Self-esteem is a sense of personal worth and ability that is fundamental to an individual’s identity.
Dictionary.com
Self-esteem is a realistic respect for or favorable impression of oneself.
Blascovich & Tomaka
Self-esteem refers to an individual’s sense of his or her value or worth, or the extent to which a person values, approves of, appreciates, prizes, or likes him or herself.
Wikipedia
Self-esteem is a term used in psychology to reflect a person’s overall evaluation or appraisal of his or her own worth.
Peter Shepherd
Self-esteem is a way of being, thinking, feeling and acting which implies that you accept, respect, trust and believe in yourself.