The iPhone can be a pocket reference guide, organizer, and practical function utility, but really only as dictated by you. The usefulness of the iPhone is in the applications that are put on it and what ends up behind the soft glass of the touch screen is by your own decree. Most people seem to have a few similar items right on their desktop. The mobile application of their favorite social networking service, a few different website mobile ports for easy use, a couple music applications, and so on. One of these that people are quickly considering standard is a dictionary for fast reference. There are dozens available at the iTunes' App Store but, as is true with most of the free iPhone applications, the brand names are often the best.
Dictionary.com has maintained its dominance amongst dictionary themed website, partially because of its cosmic success in being the one who was able to obtain that domain name. Just like any dictionary application Dictionary.com for the iPhone allows you to search for a word and then gives you a complete dictionary listing for it. This is not an abridged dictionary and comes with a very complete listing. You can expect that Dictionary.com for the iPhone is going to give you an extensive catalogue of definitions, pronunciations, and origins for your word. All of these features are going to be based around the standard dictionary and is not going to bring any kind of innovations, but that is fine when you are looking for a regular dictionary for word searching.
The Dictionary.com free iPhone application is actually two services in one. It unites both Dictionary.com and Thesaurus.com, each on their own tab. Thesaurus.com is also very complete and dependable, though it is not always going to go great for searching out slang alternatives or from obscure dialects. This does not really impede it when it comes to writing, which is when most people will use a thesaurus application. What is really great about the unity between these two features is that you can look up a word in one of them and then simply switch tabs to see the other function for that same word.
You will also get other features inside this free iPhone application such as Recent, for words that you looked up recently. You also have the Word of the Day that is, while not actually useful, mildly amusing when you are bored.
There really is not a better service that is immediately comparable offered in the form of a free iPhone application. Dictionary.com is consistently a popular solution to this need and its paired mobile application is simply the logical extension of the dictionary onto a hand held portable device. You are not going to do without something like this on your iPhone, and for a small application you cannot do better for the price. Its better than fumbling through thin paper pages anyway.
Five out of five stars. Via iTunes.