Conceptual necessity is a property of the certainty with which a state of affairs, as presented by a certain description, occurs[1]: it occurs by conceptual necessity if and only if it occurs just by virtue of the meaning of the description.
If someone is a bachelor, for instance, then he is bound to be unmarried by conceptual necessity, because the meaning of the word "bachelor" determines that he is.
Alternatively, there is metaphysical necessity, which is a certainty determined, not by the meaning of a description, but instead by facts in the world described.
Historically, Baruch Spinoza was a subscriber to this belief.
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