Ayn Rand's use of “selfishness” and “altruism” was polarizing and contrary to common usage. With the help of Venn diagrams, this essay compares and even reconciles the divergent meanings of egoism and altruism. It cites Rand's usage of “traditional egoism,” a term she used in correspondence but in none of her books or periodicals. This term helps to understand Rand's meaning of egoism. It also comments on earlier essays in this periodical about egoism.