I came across a great piece on the redefinition of marriage written by George Weigel. Here is an excerpt from the article he wrote in the National Review:
There is a curious rhetorical fact that has usually gone unremarked in these debates, but which is worth pointing out. That what the New York state legislature approved has to be described, not as marriage, but as “gay marriage” or “same-sex marriage” is itself a verbal indicator that what is being done here is counterintuitive. We all know, or thought we knew, what marriage is, and to add the qualifier “gay” or “same-sex” is a tacit admission by the proponents of the practice that it requires an appeal to authority to enforce what seems strange, odd, not right. The verbal tic of “gay marriage” or “same-sex” marriage is thus itself a rhetorical warning sign that what was done in Albany was an exercise in raw state power, the state’s asserting that it can do X simply because it claims that it has the power to do so.
You can read the whole article here.