Well, it depends on where you look up the definition. You can't really Google the term since Google tends to lie about certain things in the political arena.
Basically, fascism is an ideal that is forced upon someone whether they want it or not. "I don't like you, therefor I will shout at you until you give up or change your mind that fits my opinion of you."
Controlling by force. Fascists don't believe you have the right to speak your opinion so they'll do whatever it takes, including committing acts of violence, to stop you from saying what you want to say.
Antifa is supposed to be anti fascist but they literally practice fascism. They call the right Hitler's Nazis, but they're doing exactly what Hitler did leading up to the second world war.