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=== Measurements === * [[Mach number]] (Ma), a measure of speed compared to the speed of sound * [[Megaampere]] (MA), a multiple of the SI unit of electric current, the ampere * [[Megaannum]] (Ma), one million years * [[Milliampere]] (mA), a multiple of the SI unit of electric current, the ampere * [[myr#Debate|Myr]], [[Mya (unit)|Mya]], or Ma, meaning "million years ago"; (NB: broadly equivalent to "Megaannum (Ma)", see above)
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