'antiegoist' originates from Modern English, combining the prefix 'anti-' (from Greek 'anti-' meaning 'against') with 'egoist' (from French 'égoïste' ultimately based on Latin 'ego' meaning 'I').

'ego' comes from Latin 'ego' meaning 'I'; French formed 'égoïste' to mean a self-centered person; English adopted 'egoist' from French; in Modern English 'anti-' was prefixed to produce 'antiegoist' meaning someone opposed to egoism.

The elements originally meant 'against' (anti-) and 'I/self' (ego); combined, the coined term has meant 'opposed to self-centeredness' since its formation and retains that meaning.