A

• A-GPS - Assisted GPS
• a.c. - ante cibum
• AAA - Abdominal aortic aneurysm
• AAA - Authentication, Authorization, Accounting
• AAL - ATM Adaptation Layer
• AAR - Automatic Alternative Routing
• AARP - Apple Talk Address Resolution
• ABC - Automatic Broadcast Controller
• ABG - Arterial blood gases
• ABM - Asynchronous Balanced Mode
• ABMT - Autologous bone marrow transplantation
• ABR - Automatic Beacon Resolution
• ABR - Available Bit Rate
• ABVD - doxorubicin bleomycin vinblastine dacarbazine
• AC - Alternating Current
• ACD - Automatic Call Distribution
• ACE - Angiotensin converting enzyme
• ACEI - Angiotensin converting enzyme inhibitors
• ACELP - Agelbraic Code-Excited Linear Predictive
• ACID - Atomicity, Consistency, Isolation, Durability
• ACK - Acknowledge
• ACL - Access Control List
• ACL - Anterior cruciate ligament
• ACORD - Association for Cooperative Operations Research and Development
• ACQ - AcquittementACR
• ACR - Attenuation Crosstalk Ratio
• ACSE - A/C Set Error
• ACSE - Association Control Service Element
• ACT - Absolute Congestion Threshold
• ACTH - AdrenoCorTicoid Hormone
• ACTLU - Activate Logical Unit
• ACTPU - Activate Physical Unit
• AD - Administrative Domain
• ADA - Adenosine deaminase
• ADC - Analog-to-Digital Converter
• ADCCP - Advanced Data Communications Control Protocol
• ADD - Attention Deficit Disorder
• ADH - Antidiuretic hormone
• ADHD - Attention Deficit Hyperactivity Disorder
• ADM - Add Drop Multiplexer
• ADMD - Administration Management Domain
• ADO - ActiveX Data Objects
• ADPCM - Adaptive Differential Pulse Code Modulation
• ADR - Advanced Digital Recording
• ADSL - Asymmetrical Digital Subscriber Line
• ADSM - Adstar Distributed Storage Manager
• AF - Atrial Fibrillation
• AFO - Ankle-Foot Orthosis
• AFP - Alpha-fetoprotein
• AGP - Accelerated Graphics Port
• AH - Authentication Header
• AHF - Antihemophilic factor
• AHG - Antihemophilic globulin
• AHIP - Authentication Header IP
• AI - Artificial insemination
• AICD - Automatic implanted cardiac defibrillator
• AID - Artificial insemination by donor
• AIDS - Acquired Immune Deficiency Syndrome
• AIFF - Audio Interchange File Format
• AIFI - Italian Venture Capital and Private Equity Association
• AIH - artificial insemination by husband
• AIN - Advanced Intelligent Network - Telephony
• AIP - ATM Interface Processor
• AIS - Alarm Indication Signal - ATM
• AIT - Advanced Intelligent Tape
• AIX - Advanced Interactive eXecutive
• AJAX - Asynchronous Javascript And XML
• ALAP - AppleTalk Link Access Protocol
• ALB - Advanced Lithium Battery
• ALG - Antilymphocytic globulin
• ALL - Acute lymphocytic leukemia
• ALPS - Autoimmune lymphoproliferative syndrome
• ALS - Advanced Life Support
• ALS - Amyotrophic Lateral Sclerosis
• ALT - Alanine transferase
• ALU - Arithmetic Logic Unit
• AM - Amplitude Modulation
• AMA - Anti-mitochondrial Antibodies
• AMC - arthrogryposis multiplex congenita
• AMD - Advanced Micro Devices
• AMI - Alternate Mark Inversion
• AML - Acute myelocytic leukemia
• AMP - Adenosine monophosphate
• AMPS - Advanced Mobile Phone Service
• AMS - Acute mountain sickness
• AMS - atypical measles syndrome
• ANA - Anti-nuclear antibodies
• ANCA - Anti-neutrophil cytoplasmic antibodies
• ANF - Antinatriuretic factor
• ANF - Atrial natriuretic factor
• ANI - Automatic Number Identification
• ANP - Antinatriuretic peptide
• ANP - Atrial natriuretic peptide
• ANR - Automatic Network Routing
• ANSI - American National Standard Institute
• ANUG - Acute necrotizing ulcerative gingivitis
• AO-DI - Always On / Dynamic ISDN
• AOT - Asynch Passthru Over TCP
• AP - Alkaline phosphatase
• APC - American Power Conversion
• APE - All-Paths Explorer
• APECED - autoimmune polyendocrinopathy
• APGAR - American Pediatric Gross Assessment Record
• API - Application Programming Interface
• APIPA - Automatic Private IP Addressing
• APLS - antiphospholipid antibody syndrome
• APM - Advanced Power Management
• APPC - Advanced Program-to-Program Communications
• APPN - Advanced Peer-to-Peer Networking
• APS - autoimmune polyglandular syndrome
• APSAC - Anisoylated plasminogen streptokinase activator complex
• APTT - Activated Partial Thromboplastin Time
• ARB - Adaptive Rate Based -congestion control
• ARC - AIDS related complex
• ARDS - Adult Respiratory Distress Syndrome
• ARJ - Archive Robert Jung
• ARM - Advanced RISC Machines
• ARM - Artificial Rupture of Membranes
• ARM - Asynchronous Response Mode
• ARP - Address Resolution Protocol
• ARPANET - Advanced Research Project Agency Network
• ARPU - Average Revenue Per User
• ART - antiretroviral therapy
• AS - Aortic stenosis
• AS - Autonomous System
• ASA - Acetylsalicylic acid - commonly known as aspirin
• ASAP - As Soon As Possible
• ASCAD - arteriosclerotic coronary artery disease
• ASCII - American Standard Code for Information Interchange
• ASD - Atrial Septal Defect
• ASF - Advanced Streaming Format
• ASI - Adapter Support Interface
• ASIC - Application Specific Integrated Circuits
• ASL - American sign language
• ASO - Antistreptolisine O
• ASP - Active Server Pages
• ASP - Application Service Provider
• ASPX - Active Server Pages eXtendet
• AST - Asparagine Transferase
• ATA - Advanced Technology Attachment
• ATAPI - AT Attachment Packet Interface
• ATCC - American Type Culture Collection
• ATD - Asynchronous Time Division
• ATG - Antithymic globulin
• ATM - Adobe Type Manager
• ATM - Asynchronous Transfer Mode
• ATM - Automatic Teller Machine
• ATP - acute thrombocytopenic purpura
• ATP - adenosine triphosphate
• AUI - Attachment Unit Interface
• AUP - Acceptable Use Policy
• AV - Audio Video
• AVI - Audio Video Interleaved - Microsoft
• AVM - Arteriovenous malformation
• AVR - Aortic valve replacement
• AVVID - Architecture for Voice, Video, and Integrated Data - Cisco (r)
• AZT - azidothymidine