The FAA service providing separation services to participating airborne traffic and clearances to land, take off or taxi at airports with a control tower.

Access Tandem Connection. The interconnection between a Verizon tandem switch and another service provider's switching entity/ Point of Interface over which local traffic, EAS or IntraLATA traffic may flow to and from the end offices subtending the interconnection tandem switch.

Automatic Tube Compensation (See Automatic Tube Compensation)

Air Traffic Conference of America (a division of the Air Transport Association (ATA).

Generic term for a system designed to check the driver's reaction to signals etc. This can include cab warning systems to completely automatic control of trains. See also AWS

Auto-tracking White Balance. This is a white balance feature that accepts many types of lighting conditions by using an automatic tracking system that automatically controls the color temperature range from 2,400K to 10,000K. ATW mode ensures reliable color reproduction when lighting conditions change frequently.

Advanced Temperature Control

Air Traffic Controller belay device made by Black Diamond

A service operated by appropriate authority to monitor and regulate all air traffic departing and arriving in the United States, as well as all ground traffic within immediate airport boundaries.

Automatic Temperature Control

Additional Transportation Charge. This charge may apply when the mover provides services which were not foreseen in his quotation, or not included in his published tariff or rates schedule. It may also be used to compensate a carrier for any additional costs incurred due to traffic congestion or additional time and distance when the area for pickup or delivery is remote.

Air Traffic Controller, a belaying device made by Black Diamond. The type of belay device Touchstone recommends for use in our gyms.

Automatic Tool Change

Air Traffic Control - service operated by appropriate authority to promote the safe, orderly, and expeditious flow of air traffic.

A proprietary type of belay device. ATC stands for Air traffic controller. "B"-grade grading system for bouldering problems, invented by John Gill. Now largely superseded by the "V" grading system.

Additional Transportation Charge. A charge to compensate the carrier when service is performed in an area where costs are higher than the cost used to establish the base rates. It compensates the carrier for labor rates or other additional costs such as added time due to traffic congestion while traveling to a location for pickup or for delivery.

Air Traffic Control. The people in control towers (at airports that have them) to regulate takeoffs, landings, and planes moving through their general area.

Air Traffic Control. A computerized system that performs air traffic control tasks; ATC was necessitated by increased air traffic and enabled by the expanding capabilities of computers.

Automatic temperature compensation.

Air Traffic Control. A catch-all term for all the folks a pilot might be talking to in controlled airspace (or even outside it). ATC is concerned with keeping aircraft operating under IFR separated, helping pilots spot other aircraft and generally advising or controlling aircraft in real time (unlike an FSS).

Air Traffic Control. A ground-based radio network at many (but not all) airports, consisting of: Ground Control, which provides taxiing instructions; Tower, which provides instructions and clearances (permission) for takeoffs and landings; Departure Control and Approach Control for the airspace immediately surrounding the airport; and Center, which controls the airspace at higher altitudes. Flight Simulator procedures cover only the Tower portion of the network and only to a minor degree.

Air Traffic Conference. A now-defunct regulatory agency that dealt with the relationship between airlines and travel agents.

AIR TRAFFIC CONTROL. A service provided by the FAA to promote the safe, orderly, and expeditious flow of air traffic.

Air Traffic Control; Air Training Command

Automatic Train Control

Additional Transportational Charge. This charge compensates the carrier for services performed in areas where the labor rates are higher than the national average. It also compensates the carrier for additional costs incurred due to traffic congestion and added time traveling to the area for pickup or delivery.

Air Training Corps / Air Traffic Control

Air Traffic Controller. A popular belaying and rappelling device which, when used in conjunction with a locking carabiner, provides a safety brake on the rope.

Additional Transportation Charge. It is a regionally adjusted charge that compensates the carrier for services performed in areas where the labour rates are higher than the national average or where the additional costs are incurred due to traffic congestion

ATC was a pop group based in Germany, although the four members each came from different countries—Joseph "Joey" Murray from New Zealand, Sarah Egglestone from Australia, Tracey Elizabeth Packham from England, and Livio Salvi from Italy.

Type of L2 cache in Pentium processors that is embedded on the same core processor die as CPU.

Usually an optional feature based on ABS, it prevents spinning of the drive wheels under power on slippery surfaces by braking individual wheels and/or reducing engine throttle. Also called ASR, an acronym sometimes loosely translated from the German as anti-spin regulation.

Available Transfer Capability. Unit of measure for the transfer capability remaining in the physical transmission network for further commercial activity, over and above committed uses.

AVAILABLE TRANSFER CAPABILITY. a measure of the transfer capability remaining in the physical transmission network for further commercial activity over and above already committed uses. ATC is defined as the total transfer capability ( TTC), less the transmission reliability margin ( TRM), less the sum of existing transmission commitments (which includes retail customer service) and the capacity benefit margin (CBM). see also capacity benefit margin

Available Transfer Capability. Amount of transmission capacity available from the point of receipt to the point of delivery.

Available Transfer Capability. The amount of energy above “base conditions” that can be transferred reliably from one area to another over all transmission facilities without violating any pre- or post-contingency criteria for the facilities in the PJM Control Area under specified system conditions.

After Top Center

Advanced Technology Center

Administrative Training Center facility located at the Council office.

Academic Technology Center. resource center for faculty and teaching assistants