producing a different result each time the same piece of data is entered

The calculus is non-deterministic because the substitution mechanism does not follow any strategy for fetching resources from arguments.

In the theory of computation, a nondeterministic finite state machine is one where there may be several possible next states. 在计算理论中，非确定性的有限状态机是指有几种可能的下一个状态的机器。

likely to have a different result every time, so that it is not possible to guess what will happen

We can adopt a non-deterministic position that sees social structure as a complex system that is unstable and dynamic. 我们可以采取非确定性立场，将社会结构视为一个不稳定和动态的复杂系统。

Any voting method which is completely strategy-free must be nondeterministic, that is, it might not select the same outcome every time it is applied. 任何完全无策略的投票方法都必须是不确定的，也就是说，它可能不会在每次应用时选择相同的结果。