From my point of view, you acquire the knowledge that this system also follows the convention by guessing that it does and trying it (though I was quoting a dictionary rather than a wiki; I usually do for word definitions).

I appreciate that you don't find the analogies convincing, but they do express how I (and many others) see the situation, and declaring it a failure to stick to the topic because it doesn't fit how -you- see things is unconstructive at best.