Of course it's been defined. Has been for almost two decades. Started out in the strict dominion of white nationalists and supremacists. Then..Barack Obama was elected..and the slow rise of the alt-right into the conservative mainstream began...resulting in...Trump!

Now? It's getting so you can count the traditional conservatives on one hand. The rest, have sold out and been co-opted. Fox (if you notice I don't put the "News" on the end of it. They're not a news channel, they're an entertainment channel) dumbs their messages down into neat little packages their viewers can get outraged about easily. Keeps them coming back for more...and keeps the advertising dollars coming in. MSNBC leans to the left in their reporting, especially in their nightly line up. Counterbalance to Fox. CNN, is pretty much just the news.