In the fantasy novels of Rick Cook, an acronym for "Magical Operations Per Second." Used as a benchmark figure for the WIZ-DOS spell compiler. Similar in concept to MIPS.

Early versions of the spell compiler were benchmarked at about 300 MOPS; later versions, incorporating the additional security written into WIZ-DOS, clocked in at around 200 MOPS for spells performing heavy mathematical calculations. (To wizards in the older tradition, two hundred spells a second is still pretty impressive.)

Sources: Rick Cook, Wizard's Bane, The Wizardry Cursed