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Quantum mechanics:
Counterfactual definiteness
Then CFD is basically an ability to assume in a meaningful way, or be consistent in one's theorizing, without having to be consistent with some external datum.
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Quantum mechanics, also known as quantum physics or quantum theory, is a branch of physics providing a mathematical description of much of the dual particle-like and wave-like behavior and interactions of energy and matter.
Counterfactual definiteness
In some interpretations of quantum mechanics, counterfactual definiteness (CFD) is the ability to speak meaningfully about the definiteness of the results of measurements, even if they were not performed. (i.e., the ability to assume the existence of objects and properties of objects even when they have not been measured). More rigorously an interpretation of quantum mechanics satisfies CFD if it includes in the statistical population of measurement results, those measurements which are counterfactual due to being excluded by quantum mechanical constraints on simultaneous measurement of certain pairs of properties.
Then CFD is basically an ability to assume in a meaningful way, or be consistent in one's theorizing, without having to be consistent with some external datum.
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