page fault
when a running program accesses a memory page that is not currently mapped by the MMU into the virtual address space of a process
en-US/ˈpeɪd͡ʒ ˈfɔlt/
en-GB/ˈpeɪd͡ʒ ˈfɒlt/
when a running program accesses a memory page that is not currently mapped by the MMU into the virtual address space of a process