What is the opposite of egoism?

Socialism economic system in which major industries are owned by the workers themselves rather than by private business or the state Pugilism (boxing) combat sport held in a ring played by two boxers wearing padded gloves trying to hit one another Asceticism way of life where a person gets rid of worldly pleasures for religion or spirituality

Egoism has become a festering disease of modern society. We need a lot more altruism. Some asceticism wouldn't be a bad thing, as well.

You think of egoism as meaning "love of self", so, in that case, you would think of "humility" as being its opposite.

Ollie, You are right in your thinking. I think he was trying to stay with the suffix "ism." Humility-ism doesn't quite cut it.😁

Altruism is a swear word once you become a politician.

Heecm, I'm not sold on the definition you give for socialism.