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MAGMAMulticultural Association of the Greater Moncton Area (Canada)
MAGMAMinimal Architecture for Generalized Markup Applications (early name for eXtensible Markup Language, XML)
MAGMAMountain Area Gem and Mineral Association (est. 2000; North Carolina)
MAGMAMid-America Gospel Music Association (Farmington, MO)
MAGMAMulticast and Anycast Group Membership Working Group (IETF)