Glossary of maritime terminology
- A-Frame
- Abandon Ship
- Able Bodied Seaman
- Accommodation
- Accommodation Ladder
- Accommodation Vessel
- Act of God
- Active Fin Stabilizers
- ACV
- ACVs
- Added Mass
- Admeasurement
- Administration
- Adrift
- Afloat
- Aframax Tanker
- Aft
- Aft Peak
- Aft Peak Bulkhead
- Aft Peak Tank
- Aft Perpendicular
- Afterbody
- Afternoon Watch
- Agency Fee
- Aground
- AHTS
- Aids to Navigation
- Aids to Navigation Service Vessel
- Air Cushion Vehicle
- Air Draft
- Air Lock
- Air Lubrication
- Air Resistance
- Air Trunks
- AIS
- Alarm and Monitoring System
- Aldis Lamp
- Alfa
- All Hands
- Alleyway
- Allision
- Alongside
- Amidships
- AMS
- Anchor
- Anchor Ball
- Anchor Buoy
- Anchor Cable
- Anchor Chain
- Anchor Handling Tug
- Anchor Lights
- Anchor Pocket
- Anchor Rode
- Anchor Rope
- Anchor Watch
- Anchor Windlass
- Anchorage
- Anti-Exposure Suit
- Anti-Fouling Paint
- Anti-Fouling System
- Anti-Heeling System
- Anti-Rack Spacer System
- Anti-Roll Tank
- Appendages
- Apron
- ARPA
- Arrest
- Articles of Agreement
- Assembly Station
- Astern
- Athwartships
- Atrium
- Auto Container
- Auto Mooring System
- Automatic Identification System (AIS)
- Automatic Radar Plotting Aid (ARPA)
- Autonomous Vessel
- Autopilot
- Auxiliaries
- Auxiliary Boiler
- Auxiliary Crane Shp
- Avast
- Awash
- Aweigh