Egotism is the belief that you are much better or more important than other people. It also names the habit that grows from that belief: talking about yourself a lot, and turning every story back to you. This is the social fault, not a school of thought. The nearby word egoism is the idea that people act for themselves. Egotism is the loud 'I, I, I.' Teachers and dictionaries sometimes slide the two together; in careful use they are not the same. The noun is a little formal. In daily talk people more often say someone is full of themselves, or call them egotistical. You can have quiet pride without egotism. Egotism is when there is no room left in the sentence for anyone else.

自大；自我中心（覺得自己比別人了不起）。