Choosing a definition is a key step in writing a definition essay. You need to understand the term before you can define it for others. Read the dictionary, but don't just copy the definition. Explain the term briefly in your own words. Also, it's important to limit your term before you start defining it. For example, you could write forever on the term "love." To limit it, you would write about either "romantic love," "platonic love," or "first love."
Define by analysis. Compare the term to other members of its class and then illustrate the differences. These differences are special characteristics that make the term stand out. For example, compare a Siberian husky to other dogs, such as lap dogs, mutts, or sporting dogs.