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Translation Lookaside Buffer: a small piece of associative memory within a processor which caches part of the translation from virtual addresses to physical addresses. Such translations can often be very large and complex and the data structures that implement them too large to store efficiently on the processor. Instead, a few elements of the translation are stored in the TLB, which the processor can access extremely quickly. If a required translation for a particular virtual address is not present in the TLB the address will be resolved using the more general mechanism. Also referred to as Address Translation Cache.