[baddox]

That's generally what people mean when they say "nondeterministic" in the context of computing. Yeah, in philosophy it generally means something like "the future is not completely determined by the past," but in computing it means something closer to "the programmer cannot reasonably determine the behavior and thus should not depend on specific behavior."

[mypalmike]

In computing it means a given set of inputs lead to a given set of outputs. It has nothing to do with how difficult it is for a programmer to reason about. Deterministic builds, deterministic tests, etc.

[Dylan16807]

But what counts as "input" will vary based on who you ask and under what context.