If you are a regular user of the website http://www.dictionary.com/, you must have experienced that it has been evolving from time to time. The services it provides are absolutely very useful. It is a free dictionary available online. The company survives by advertising. They have really thought about user preferences and I think they have studied about the psychology to a greater extent. Having the home page (http://www.dictionary.com/) with one big advertisement and only the search box is a very good tactic. I myself spent some time reading the advertisement before I started typing.
You must have not noticed but our brains have developed advanced filters (without our knowledge) which filters all unwanted (which we think unwanted) content from our view. For example if we see the word Google in a website our brain flags it as an advertisement and moves our attention away from it (you know what I’m talking about). The dictionary.com has its own strategy with regards to advertising. The adverts which appear in the search results are very attractive. Actually you might sometimes not notice that they actually are paid advertisements as they have kept them in the same style as of the actual dictionary results. The user is forced to go passing the adverts to the actual result which is bit unethical I would say, but it works. I think the advertisements get the full attention. For an example if we search for the word "education", below is the result you get.