Dreaming about a spider can indicate that a person is feeling like an outsider in a situation. It can also be a symbol for feminine power, and can indicate an overbearing female in one's life.
In addition to representing feelings of being an outsider or indicating feminine power, dreaming about spiders can have other meanings. If someone kills a spider in a dream, for instance, it can symbolize bad luck and misfortune. Seeing an already dead spider can indicate that someone has overcome strong feminine temptation. Furthermore, seeing a spider spin its web in a dream can indicate that the dreamer will soon be recognized for hard work. It can also be a symbol of creativity.