| Entry | Explanation |
|---|
| a | Area, Aft |
| A | Ampere |
| a.o.e. | Any One Event |
| a.o.r. | Any One Risk |
| a/o | And/or, Account of |
| a/r | All risk, against all risk |
| a/s | Alongside, after sight, account sales |
| A1 | Fist class condition |
| ab | from |
| ABP | Associated British Ports |
| ABS | American Bureau of Shipping |
| abt | About |
| Acc, a/c, act | Account |
| ACOT | Advisory Committee on Offshore Technology |
| ACP | Area Contingency Plan |
| ad | after date |
| Ad.val | According to Value (lat. ad valorem) |
| ADB | Africa/Asian Development Bank |
| Adcom | Address Commision |
| aero | Aeronautical light |
| af | Advance freight |
| afaa | As Far As Applicable |
| AFRA | Average Freight Rate Assessment |
| AFRASEC | Afro-Asian Orginazation for Economic Cooperation |
| AGW | All going well |
| ah | Antwerp/Hamburg range, eller Aft Hatch |
| AHL | Australian Hold ladders |
| AID | Agency for International Development |
| AIMS | American Institute of Merchant Shipping |
| AIMU | American Institute of Marine Underwriters. |
| AL.WR | Alternating light |
| ALRS | Admiralty List of Radio Signals |
| alt | Altered, Altitude |
| ALU-TUCP | Phillippine Seafare`s Union |
| am | After Middnight, 0000 - 1200. lat. ante meridiem |
| AMOSOP | Association of Marine Officcers and Seamens of the Philippines |
| AMSA | Australian Maritime Safety Authority |
| AMVER | Automated Mutual Assistance Vessel Rescue System |
| ANTHAM | Antwerp-Hamburg Range |
| ANZDL | Australia New Zeeland Direct Line |
| AODC | Association of Offshore Diving Contractors |
| AORE | Atlantic Ost Region |
| ap | Additional Premium, All Purpose, Auto Pilot |
| APL | American President Line |
| App. | apparante |
| Apprx | Approximately |
| aps | Arriving Pilot Station |
| ara | Antwerp/Rotterdam/Amsterdam - range |
| ARAG | Amsterdam-Rotterdam-Antwerp-Gent Range |
| ARAMCO | Arabian American Oil Company |
| arb | Arbitration |
| arnd | Around |
| artd | After right and true delivery |
| asa | Always Safe Afloat |
| asap | As soon as Possible |
| ASEAN | Association of South East Asian Nations |
| ASF | Asian Shipowners Forum |
| ASPH | Automatic Seaborne Pallet Handling |
| ASRY | The Arab Shipbuilding and Repair Yard, Bahrain |
| ASW | Anti Submarine Weapons |
| ata | Actual time of Arrival |
| ATA | Automatic Tracking Aid |
| atc | Actual Time Counting |
| atd | Actual Time of Departure |
| atdn | Any Time Day or Night |
| atdnhinc | Any Time Day or Night and Holidays Included |
| ATG | Aarhus Transport Group |
| atl | Atlantic |
| ATT | Admiralty Tide Tables |
| ATUTC | Actual Times Used to Count |
| aux | Auxillaries |
| awb | Air Way Bill |
| AWES | Association of European Shipbuilders |
| awslo | All Working Time Saved Loading Only |
| AWT | Automated Water Treatment |
| awtsbe | All Working Time Saved Both Ends |
| awtsdo | All Working Time Saved Discharge Only |
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