Diameter is double the radius of a circle, but it is can also be used to describe the distance from one side of an object to another....

....at least that's how I've been taught...maybe it's one of those occasions where the usage of a word has evolved differently in different parts of the world or different fields...

Well, it's one louder, isn't it? It's not ten. You see, most blokes, you know, will be playing at ten. You're on ten here, all the way up, all the way up, all the way up, you're on ten on your guitar. Where can you go from there? Where?