According to the Associated Press, Merriam-Webster recently decided 100 new words were worthy of inclusion in the latest edition of its Collegiate Dictionary. Why so few?

Among the words are pescatarian (a fish-eating vegetarian), infinity pool (an outdoor pool with an edge disappearing into the horizon), dirty bomb, and netroots.

I love these particular words and some of the others cited in the article, but overall the collection seems arbitrary – why these and only these? The explanation included in the article (which I won’t quote since this is an AP story) relies on subjectivity, which is understandable but begs the question of whose experience and resulting subjectivity constitute sufficient authority.

Ah, the pros at Merriam-Webster.

Which brings up the role of dictionaries and to what extent we should be relying on them. If I want to use a common word that hasn’t yet made it into the Merriam-Webster Collegiate Dictionary, a word such as, uh, conjobulated, am I wrong? Should English teachers redline such usage if my readers understand it?

Since dictionaries often disagree – will the American Heritage Dictionary and the Oxford American Dictionary include the same 100 words? – it’s important not to think of any one dictionary as the arbiter of the words you can use. (And of course there are those who think we shouldn’t be adding any new words or new uses of existing words, but I dismiss these folks as eccentric and unimaginative and relegate them to a parenthetical.)

A useful dictionary evolves over time to reflect how we actually use words – though long publishing cycles mean they live most of their lives out of date. And their real value is not in dictating what words we can use, but as a resource for understanding words we encounter but don’t recognize. That is, they can help us understand what we are reading or listening to, and they can help us build a larger working vocabulary.

Writers, however, need to focus on their readers and the words their readers use and understand. Think about it. What’s more important, being right according to some arbitrary standard or communicating effectively? Both you say? Then which dictionary (or grammar book or language watcher) do you believe?

Instead, be an aggressive reader and listener. If you demand that what you encounter makes sense, then you will refine your understanding of how words – old and new – are used, and you can refer to dictionaries as needed. For words not in your dictionary, search them out on the Internet and try sites like Merriam-Webster’s Open Dictionary and Urban Word of the Day

Please don’t misunderstand. I’m not recommending that you use any word any way you want. Remember Humpty Dumpty. But feel free to enjoy the full richness of our constantly changing language, as long as you take your readers or listeners into account, so you are communicating clearly and effectively whatever your purpose may be.