| Acronym | Definition |
|---|
| AM | Amplitude Modulation |
| AM | Ante Meridiem (period between midnight and noon) |
| AM | American |
| AM | Armenia (top-level domain) |
| AM | Amen (epigraphy) |
| AM | Amos |
| AM | Asset Management |
| AM | Against Me! (band) |
| AM | Account Manager |
| AM | Aston Martin |
| AM | Above Mentioned |
| AM | Alma Mater |
| AM | Alanis Morissette |
| AM | Application Management |
| AM | Amazonas (Brazil) |
| AM | Arctic Monkeys (UK band) |
| AM | Area Map (FAA ARTCC mapping of Sector Suites to an Area) |
| AM | Alyssa Milano |
| AM | Ave Maria (Latin: Hail Mary) |
| AM | Airmail |
| AM | Assistant Manager |
| AM | Antrim (Ireland) |
| AM | After Market |
| AM | American Morning (CNN Morning Show) |
| AM | AeroMexico (IATA Airline Code) |
| AM | Associate Member |
| AM | Après-Midi (French: Afternoon) |
| AM | Alert Message |
| AM | Adhesion Molecule |
| AM | Absent Minded |
| AM | Arranged Marriage |
| AM | Application Manager |
| AM | Address Management (USPS) |
| AM | American Motors (purchased by Chrysler) |
| AM | Afore Mentioned |
| AM | Action Man (cartoon series) |
| AM | Active Matrix |
| AM | Assembly Member |
| AM | Alonzo Mourning (basketball player) |
| AM | Age-Matched (Z-score used in conjunction with DEXA scan reports) |
| AM | Air Mass |
| AM | Alaskan Malamute (dog breed) |
| AM | Alveolar Macrophages |
| AM | Away Message (instant messaging) |
| AM | Alpes-Maritimes |
| AM | Acrylamide |
| AM | Access Method (Sprint) |
| AM | Americium |
| AM | Air Marshal |
| AM | Audit Manager |
| AM | Attacking Midfielder (soccer position) |
| AM | Animation Master (3d animation software) |
| AM | Agricultural and Mechanical |
| AM | Active Mode |
| AM | Accounting Management |
| AM | Arithmetic Mean |
| AM | Access Module |
| AM | Accounts Manager |
| AM | Aviation Management (US Department of the Interior) |
| AM | Aide Mémoire (French:memorandum) |
| AM | Air Methods (medical helicopter company) |
| AM | Analysis Manager |
| AM | Accredited Member |
| AM | Agile Methodology |
| AM | Arts et Métiers (French Engineers School) |
| AM | Achievement Medal |
| AM | Advance Mission |
| AM | Agile Modeling |
| AM | Air Ministry |
| AM | Air Medal |
| AM | Asynchronous Mode |
| AM | Arrêté Ministériel (Belgium cabinet decree) |
| AM | Al-Muhajiroun |
| AM | Member of the Order of Australia |
| AM | Activity Manager |
| AM | Aeronautica Militare (Italian Air Force) |
| AM | Aviation Medicine |
| AM | Annuity Mortgage |
| AM | Air Mobile |
| AM | Actinomycosis (skin disease) |
| AM | Active Monitor |
| AM | Alternate Mode |
| AM | Analog Multiplexer |
| AM | Accelerated Math |
| AM | Arch Mage (gaming) |
| AM | Assembly Management |
| AM | Auto Map |
| AM | Alternating Magnetic |
| AM | Amplitud Modulada (Guatemala radio frequency) |
| AM | Accounts Maintenance |
| AM | Ante Meridian |
| AM | Attometer (10 E^-18, one quintillionth) |
| AM | Army Management |
| AM | Anno Mundi (Latin: in the year of the world) |
| AM | Arthrogryposis Multiplex (genetic defect; cattle) |
| AM | Action Memorandum |
| AM | Avant Midi (French) |
| AM | Airway Manual |
| AM | Albert Medal |
| AM | Advanced Mission (game) |
| AM | Accountability Measure (NMFS - fisheries management) |
| AM | Automation Module |
| AM | Automod (defunct GameFAQs feature) |
| AM | Architecture Manager (Intel) |
| AM | Alarm Module |
| AM | Auxiliary Memory |
| AM | Administrative Module |
| AM | Artium Magister (Latin: master of arts) |
| AM | Aviation Structural Mechanic (USN Rating) |
| AM | Auxiliary Module |
| AM | Adeptus Mechanicus (game) |
| AM | Auxiliary Motor |
| AM | Acknowledge Message |
| AM | AlterMeta (web comic discussion) |
| Am | Apramycin |
| AM | Acoustic-Magnetic |
| AM | Accommodation Manager |
| AM | Annie Man (Hong Kong actress) |
| AM | Activation Manager |
| AM | Authorized Messenger |
| AM | Address Modifier |
| AM | Airborne Mapping |
| AM | Agent Metal (music composition group) |
| AM | Antimateriel |
| AM | Appliance Manufacturer Magazine |
| AM | Associate of Music (degree) |
| AM | Airfield Matting |
| AM | Ancient Modulation (humor) |
| AM | Application Mediation |
| AM | Asymmetric Multiplier (NIOSH) |
| AM | Aggressive Mechanism |
| AM | Access Macro Virus |
| AM | Anillo Metropolitano (Guatemala region) |
| AM | Ambulance Module |
| AM | Analog Maintenance (Nortel) |
| AM | Atlantic Microsystems (Bell Atlantic & Nynex Wireless Cable) |
| AM | Auricularis Muscle |
| AM | Adaptive Multiplexer |
| AM | Application Mediators |
| AM | Automated MICAP |
| AM | Agencia de Monitoreo (Guatemala, security agency) |
| AM | Acquisition Management/Manager |
| AM | Autoservizi Meridionali (charter bus company in Naples, Rome and Parma, Italy) |