Definitions for "Cache miss"
occurs when the processor requests data from memory and the data requested is not in the cache memory. When this occurs it is necessary to access the next level in the memory hierarchy (potentially the main memory) to retrieve the data. [SILC99
(n.) A cache access that fails to find the requested data. The cache must then be filled from main memory at the expense of time.
a Web browser request that cannot be satisfied from documents stored in the cache and must be forwarded to the application Web server