In political science definitions aren't prescribed, they are described. The meaning of liberalism is dependent on what actors who call themselves liberal say or do.
There are different kinds of liberalism. There is social liberalism, classic liberalism, conservative liberalism, etc. Considering how broad liberalism is, for most people it doesn't make sense to "oppose" liberalism.
Whoa, way to escalate a discussion. I thought we all fled from Reddit because of things like this.
Liberalism is not a single ideology. I wrote a few other replies to explain this. Check the Wikipedia page on liberalism in Europe, it's quite diverse.
https://en.m.wikipedia.org/wiki/Liberalism_in_Europe