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 for page fault
From The Free On-line Dictionary of Computing (30 December 2018) :

  page fault
      In a paged virtual memory system, an
     access to a page (block) of memory that is not currently
     mapped to physical memory.  When a page fault occurs the
     operating system either fetches the page in from secondary
     storage (usually disk) if the access was legitimate or
     otherwise reports the access as illegal.

Contact=webmaster@dict.org Specification=RFC 2229