Having several operating systems available, such that any of them can be selected each time the computer is booted.(adjective)
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Use "multiboot" in a sentence
"I have friends who have to multiboot their Macs with slightly different OS versions so they can run software on one version and printer or scanner devices off another."
"I get Xen working, though; it was painless now that NetBSD's boot loader can do multiboot kernels, meaning I didn't need to mess with GRUB; I just installed the xen tools, and a xen kernel, and a NetBSD/xen kernel, then added the following line to /boot.cfg:"
"What I want to do is install all four Linux distributions and multiboot them."