Open Dictionary provides a more ‘official’ alternative to Urban Dictionary
Every now and again I come across a word (usually online) that I’m not 100% sure of. If it seems like a ‘legitimate’ word, I’ll look it up on dictionary.com, or OneLook (which searches multiple online dictionaries). If it seems like new slang or a buzzword I’ve never heard of, I’ll usually go to Urban Dictionary.
The only problem I find with Urban Dictionary (besides that occasionally I find out about fairly disturbing words and concepts) is that it relies completely on user submissions. While this keeps it really up-to-date, and people can vote submissions up or down, it means that you might not get very reliable (or well-written) information.
MacMillan Dictionary has come up with a pretty good midway point between an official online dictionary, and a user-submission based one. Open Dictionary takes user submissions, but they are vetted and approved by MacMillan before they are published online. At the moment there aren’t too many submissions, but I feel like that won’t last too long. To find out what words like tweath and glamping mean, check it out.