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enough to declare the sentence to be devoid of meaning! — I think it must be clear that we have nothing to do with this use of the term "verifiability", and that we must have had something else in mind when we said that the Meaning of a Proposition was its Method of Verification.
As a matter of fact, we call a proposition verifiable if we are able to describe a way of verifying it, no matter whether the verification can actually be carried out or not. It suffices if we are able to say what must be done, even if nobody will ever be in a position to do it.