Could you elaborate on why you think the meaning of the word has changed? If I'm understanding you correctly, it sounds to me like you think the current use of

Could you elaborate on why you think the meaning of the word has changed? If I'm understanding you correctly, it sounds to me like you think the current use of the word in the USA is restricted to one narrow activity of debating societies (formal tournaments where neither side is, a priori, invested in a particular idea and in fact doesn't even know which side of the debate they'll have to represent). This is just one of many things debating societies do, and yes it does have a sport element as you and others suggest. But, based on my experience (and I have quite a lot with debating societies in both the USA and the UK) I don't think this one activity has come to dominate what "debate" means in the USA. I would be surprised if the average citizen thought in this way. So I wonder what makes you think this activity has come to be the meaning of debate in the USA, as opposed to just one thing debating societies do? P.S. purely as an aside I think there may be misunderstanding about the value of people advocating "views they may not even hold". This is only characteristic of tournaments, and is a feature not a bug. Since you don't know until quite late which side you will represent, it forces you to be prepared to do an equally good job representing either side. This is, in my opinion, an excellent mental exercise. At the moment the debate happens, you are arguing something one-sided you may not believe — but in the preparation for the debate you are carefully evaluating the best arguments for both sides.