Merriam-Webster updated their definition to include same-sex couples and WorldNetDaily is predictably pissed. Actually, the change happened in 2003. Webster Associate Editor Kory Stamper responds:

We often hear from people who believe that we are promoting -- or perhaps failing to promote -- a particular social or political agenda when we make choices about what words to include in the dictionary and how those words should be defined...In recent years, this new sense of 'marriage' has appeared frequently and consistently throughout a broad spectrum of carefully edited publications ... Its inclusion was a simple matter of providing our readers with accurate information about all of the word's current uses.

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