Definition:
AC             Alternating Current.
A/G           Air Ground.
AGC          Automatic Gain Control.  
AIC           Ampere Interrupting Capacity.
AM            Amplitude Modulation.
A               Ampere.
ANSI        American National Standards Institute.
ATC          Air Traffic Control
ATCT       Air Traffic Control Tower
ATO         Air Traffic Organization
BIT           Built-in Test
CBEMA   Computer and Business Equipment Manufacturer’s Association
CD            Compact Disc
CEDEX    Courrierd Entreprise a Distribution Ex-Ceptionnelle  
CFR          Code of Federal Regulations
CPU          Central Processing unit
CVRTM   Contractor Verification Requirements Traceability Matrix
CW           Continuous Wave
dB             Decibel
dB(A)       A-Weighted Decibel
dBc           Decibels  Referenced To Carrier
dBm          Decibels Referenced To 1 Milliwatt
C-degree   Degree Celsius
F-degree   Degree Fahrenheit
DSB-AM Double Sideband Amplitude Modulation
DVD        Digital Video Disc
EEPRPM Electronically Erasable Programmable Read-Only Memory
EMC        Electromagnetic Compatibility
EIA          Electronic Industries Alliance
ESD         Electrostatic Discharge
ETR         Emergency Transceiver Radio
ETSI        European Telecommunications Standards Institute
FAA         Federal Aviation Administration
FAT         Factory Acceptance Test
FCC         Federal Communications Commission
FIFO        First In, First Out
FM           Frequency Modulation
ft              Foot
GB           Gigabyte
HF           Human Factors
HFDS      Human Factors Design Standard
Hz           Hertz
ICD         Interface Control Document
ICAD      International Civil Aviation Organization
ID           Identification
IEC         International Electrotechnical Commission
IEEE       Institute of Electrical and Electronics Engineers
ISO         International Organization For Standardization
kHz         Kilohertz
LED        Light Emitting Diode
LRU        Line Replaceable Unit
mA          Milliampere
MB          Megabyte   
MDT       Maintenance Date Terminal
MHz        Megahertz
ms           Millisecond
MTBF     Mean Time Between Failures
MTTR     Mean Time To Repair
N/A         Not Applicable
NAS        National Airspace System
NEMA    National Electrical Manufacturers Association
NEXCOM Next Generation Air/Ground Communications System
NFPA     National Fire Protection Association
NILA      National Telecommunicstions  and Information Administraton