What does "selfishness" mean?

Selfishness: The quality or state of being selfish; exclusive regard to one's own interest or happiness; that supreme self-love or self- preference which leads a person to direct his purposes to the advancement of his own interest, power, or happiness, without regarding those of others. Selfishness,- a vice utterly at variance with the happiness of him who harbors it, and, as such, condemned by self-love. Sir J. Mackintosh.