Does not matter what topic you will choose, what is really important: really believe that you will find your audience. The topic that you are going to choose needs to be interesting for you personally, in other case it would be really difficult to gather all facts and general information to make a good paper. You need to ask yourself: will my future work be interesting to read? Has my future essay a perspective to become a reason for discussion? Is it possible to be serious in talking about this theme but not so much serious to put to sleep this one, who will read it? If the answers are yes, you have a good chance to write an outstanding definition essay.