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1) (shortened from mental block) A sort of organic stoprule or safety valve that prevents people from going crazy when they consider thought experiments exploiting combinatorial explosion. "It's a good thing I had a block just then! I was getting a trifle dizzy when he started going on about storing all the possible descriptions of the universe in a book made out of tiny galaxies pretending they're electrons."

2) A small but obdurate obstacle preventing the smooth operation of a mechanism, a spanner in the works. Hence, mental block, an objection to functionalism obsessively maintained in the face of all manner of refutations, blandishments and appeals to common cause.