"Determinate" means fully dependent on some other factors, and therefore predictable if those factors were known -- theoretically. Theoretically, for the dynamics can be complex, and small changes in the inputs sometimes result in large changes in the outputs. For example, the weather is fully determinate on atmospheric thermodynamics within the earth's gravity, i.e. temperature, pressure, windspeed, and the rotatation/gravity of the planet, all of which can be measured; but weather forecasting is not fully an exact science.
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