Kant lists, in his table of categories, three categories (as with the other groups) of modality, and those are:
-actuality,
-possibility and
-necessity
We may feel pretty safe and liberal to add the fourth one, which would be the negation of possibility – impossibilty. Impossibility has the exactly opposite effect to necessity in that it implies non-actuality, while necessity implies actuality. Everything that is necessary is also possible, but not MERELY possible as I like to say, but possible and also has an impossible opposite or contradictory. Mere possibility though implies absolutely nothing about actuality one way or the other, but merely that the thing or event in question is POSSIBLY ACTUAL, but that is pretty much the very meaning of possibility, and isn’t an additional effect.
The category of ACTUALITY though, it seems to me, is a sui generis category of modality, if we consider it a modal category at all, since all the other categories are inter-definable by the negations of each other, while one cannot define actuality that way. YES, actuality IMPLIES possibility, but it is not coextensive with it since, even though all the actual things must be (at least) possible, not all possible things are actual. Likewise, even though necessity implies actuality, actuality does not imply necessity back, because what is actual may also be „merely“ possible, i.e. contingent. So, necessity and actuality are not equivalent either (of course, since they would then be one category) but also one cannot be defined as the negation of the other. And for the relation of actuality to impossibility (the third and last other modal category) also cannot provide a definition of actuality, since, even though what is actual is not impossible (by definition), non-impossible (possible!) things may still fail to be actual.
Thus, actuality stands in a pretty unique predicament among all the categories of modality, and proves to be one of a kind. As for its definition, that seems like a daunting task, but perhaps we could say that actuality is what obtains, is true, is real, or is the case. The best we can come to a determination of those, if we accept empiricist epistemology, is that what is actual APPEARS OR CAN APPEAR in VERIDICAL sense experience. The actual is a subset of the possible that has found its fulfilment or satisfaction, and it seems to present a brute bottom-line of our thinking about the world, so we may even take it as a primitive concept that we don’t or that cannot itself be defined, on pains of going deeper than the deepest layer of what exists or is apparent to us, the bare and naked presence of the world and worldly things and events.
Miodrag Vujaković
25. 06. 2025
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