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absolute gain - Of an antenna, for a given direction and polarization, the ratio of the power that would be required at the input of an ideal isotropic radiator to the power actually supplied to the given antenna, to produce the same radiation intensity in the far-field region. Of a device, the ratio of the signal level at the output of the device to that of its input under a specified set of operating conditions.

ALMA - Atacama Large Millimeter/Submillimeter Array (Radio telescope antenna)

AMOLED - active-matrix organic light-emitting diode (HP iPAQ Glisten)

AMRAAM - Advanced Medium Range Air-to-Air Missile

APC - Adaptive Predictive Coding; American Power Conversion, makers of the Universal Notebook Battery

ASNAP - Automatic Switching of Network Access Points

AVP - Association of Volleyball Professionals