Reality is the world or state of things as they actually exist, independent of any idealistic or notional idea of them.
Truth is that which corresponds to reality.
Meaning is a relationship stated in a context. What's the meaning of water? To a thirsty man, water means life. To a drowning man, water means death. To Vegas tourists in front of the Bellagio, water means entertainment (as well as refreshment, if they're carrying water as they should).
Take this statement for example: "A tidder is an invisible creature that makes you mistype things on the keyboard."
Is that statement true or false? In other words, does it correspond to reality or not? We could go in lots of directions, such as getting tidder believers in fights with atidderists, but this wouldn't accomplish much.
The ultimate problem here is that the statement never identifies to what part of reality it is supposed to compare. No relationship to reality is given, so it's simply a statement without meaning.
If you can't even identify meaning, then you can't begin to investigate whether something corresponds to reality. In other words, you can't determine whether the statement has any truth. It is simply meaningless.
