Here are a few. There are more. I always try to mean the one that is most appropriate in the moment:
MAMassachusetts (US postal abbreviation)
MAMature Audiences (TV program rating)
MAMilliampere
MAMildly Amused
MAMarket America (independent entrepenurial corporation founded by James H Ridinger)
MAMaster
MAMaterials
MAMoving Average
MAMedical Assistance
MAMaintenance
MAMedical Assistant
MAMeta Analysis
MAMilitary Academy (West Point, NY)
MAManagement Accounting
MAMicrosoft Access
MAMove Along
MAMannheim, Germany (license plate)
MAManual (welding)
MAMathematics
MAMid-Atlantic (region; various organizations)
MAMetropolitan Area
MAMonoclonal Antibody
MAManitoba
MAMorocco (ISO country code, top level domain)
MAMultiple Access
MAMadagascar (Malagasy)
MAManagement Agent (metadirectory services)
MAMartial Artist (gaming, Anarchy Online)
MAMedicare Advantage
MAMexican American (classification)
MAManagement Analyst
MAMilitary Applications
MAMassive Attack (band)
MAMaranhao (Brazil)
MAMap Analysis
MAMillion Years (geology)
MAMission Accomplished
MAMarin Academy (California)
MAMittelalter (German: Middle Ages)
MAMethamphetamine
MAMaranhão (Brazilian state)
MAMedical Advisor
MAMichael Alexander (jewelry)
MAMilitary Attaché (US Navy)
MAMission Assurance (Homeland Defense)
MAMarijuana Anonymous
MAMaintenance Agreement
MAMultiple Award
MAMartha Argerich (pianist)
MAMechanical Advantage (machines)
MAManagement Activity
MAMeasurement and Analysis (process area; Capability Maturity Model Integration)
MAMaanantai (Finnish: Monday)
MAMorbid Angel (band)
MAMaster-at-Arms (military rating)
MAMartial Artist (gaming)
MAMaritime Administration
MAMember Association (various organizations)
MAMemetic Algorithm (evolutionary computing)
MAMaleic Anhydride
MAManagement Accounts
MAModified Atmosphere
MAMental Age
MAMarketing Authorization
MAMean Average (mathematics)
MAMetropolitan Area Network
MAMulti-Access
MAMagister Artium (Master of Arts)
MAMissed Abortion
MAMultimedia Authoring
MAMission Area
MAMandelic Acid
MAModern Apprenticeship
MAMobile Armor (Gundam series)
MAMobile Assistant
MAMonitoring Agency
MAMajor Arcana (Lineage 2 game armor set)
MAMedical Attendant
MAMechanical Animals (Marilyn Manson album)
MAMission Analysis
MAMicroaneurysm (ophthalmology)
MAMetabolic Analyzer (US NASA)
MAMass Analyzer
MAMolecular Absorption
MAMaterials Analyst
MAMissed Approach
MAMilitary Assistant
MAMoored Alongside
MAMaintenance Action
MAMortuary Affairs
MAMaître Auxiliaire (French: Adjunct Professor)
MAMissed Appointment
MAMedical Administrator
MAMinnehaha Academy (Minneapolis)
MAMotorcycling Australia
MAMission Assignment
MAMasurium (element)
MAMobility Agent
MAMultiple Answer
MAManaged Availability (computing)
MAMinor Arterial (State highway Information)
MAMinor Actinide
MAMaximum Allowance
MAMargin Agreement
MAMessage Analysis
MAMethanandamide
MAMain Assist (Everquest)
MAMiddle Assyrian
MAMarshalling Area
MAMakarska, Croatia (license plate)
MAMagnetic Amplifier
MAMission Abort
MAMaintenance Administrator
MAMaster Administrator
MAManual Assist (nursing)
MAMilitary Aircrew
MAMaintaining Activity
MAManagement Advocate
MAMusic Ant (online guide for music software)
MAMaître Ès Arts (French: Master of Arts)
MAMega Annum (one million years, geological chronology)
MAMobilization Assistant
MAMerchandise Analyst (retail)
MAMaintainability Analysis
MAMaintenance and Adaptation (ATMF)
MAMobile Allocation (PCS - GSM)
MAManufacturing Approval
MAMesh Antenna
MAMotorist Assist
MAMachine Accountant (Naval Rating)
MAMemory Administration
MAMatureAsskickers (gaming clan)
MAMini Alert (System Sensor Sounder)
MAMechanical Ambush
MAMaster of Audiology
MAMulti-Alert (system sensor brand name)
MAMediArchive (website)
MAMagical Alliance (gaming group)
MAMJU Alert (Hekimian)
MAWillys-Overland 1/4 Ton 4 X 4 Truck (1st Model of WWII Jeep)
MAMalev Hungarian Airlines Limited - Hungary (IATA airline code)
MAMakeshift Apathy (Michigan band))
MAMANPRINT Assessment
MAMultichambered Autoinjector
MA(USN Rating) Master-At-Arms
MAMiscible Accounting
