(1) (Last In Last Out) See FIFO.
(2) (LInux LOader) A popular boot loader for Linux prior to the Grand Unified Bootloader (see GRUB). When LILO loads, each letter of the acronym is displayed after some stage of the load process has taken place. If the boot fails, the letters denote the successful stages. ELILO is the LILO version for machines with the EFI boot system. See UEFI and boot loader.