Determinism: The world is governed by (or is under the sway of) determinism if and only if, given a specified way things are at a time t, the way things go thereafter is fixed as a matter of natural law.
That's annoying. It implies causality but doesn't actually require it, even though the article is specifically on Causal Determinism, which is distinct from just plain determinism. I'm sure it's explained somewhere in there, but you know what? I don't care. You can have at it if you want.
If determinism is true, then given a complete, perfect and accurate description of the universe at one time, and enough memory and time to compute upon it, you could model any future state of the universe from that.
That's causality. If you have perfect causality, and perfect knowledge of the present, then you can predict the future. That's not determinism. Causality is one way of getting to determinism, but it isn't a requirement.
Determinism is basically what I described before as inevitability, although I didn't want to use the jargon because it has connotations which I'm not wholly comfortable discussing.
"Indecision is the basis of flexibility" -- button at a Science Fiction convention.