Half: A half of a circle in your dream may represent being diametrically opposed to something.
If the image of half features strongly, it may also indicate lack of thoroughness, doing things by halves or something carried out to an excessive degree e.g. being too clever by half. Another interpretation suggests something that is incomplete, imperfect, having vague intention, not being fully committed to something or having half a mind to do it. Sharing expenses or ‘going halves’ is another possible interpretation. It may also symbolize the number two, as a third might symbolize the number three, fourth four, fifth five, sixth six and so on.