This refers to a focus on one's own needs and desires, often disregarding the feelings or needs of others. It's commonly used to describe behaviors that prioritize personal gain over collective well-being.

This indicates an excessive preoccupation with oneself, often accompanied by a belief in one's superiority. It can be used to describe attitudes that are arrogant or narcissistic.

This is a philosophical concept often associated with the idea that individuals act in their own self-interest, which can justify actions that might hurt others.

This meaning highlights a viewpoint where one’s own perspective is taken as the only valid one, leading to a lack of empathy towards others.