British English to American English: Letter A
Abattoir 	Slaughterhouse
          About-turn 	About-face
          Above stairs Upstairs
          Abseil Rappell/rapel??
          Absolutise Absolutize
          Acceptance race Allowance race
          Accessorise Accessorize
          Accident & Emergency (A&E) Emergency Room (ER)
          Acclimatise Acclimatize/acclimate
          Acclimatisation  Acclimatization
          Acclimatised  Acclimatized
          Acclimatising  Acclimatizing
          Accomodation Accommodations
          Accountancy Accounting
          Accoutre Accouter
          Acidise Acidize
          Acknowledgement Acknowledgment
          Acknowledgeing Acknowledging
          Acknowledgeable Acknowledgable
          Action replay Instant replay
          Action stations Battle stations
          Actualise Actualize
          Adaptor Adapter
          Adjacent Catercorner?
          Admiralty cloth Melton cloth
          Admiralty mile Nautical mile
          Adventure playground Children’s playground
          Advert Ad
          Advertise Advertise (or advertize)
          Advertising Advertising (or advertizing)
          Advertisement Advertizement
          Adviser/s Advisor/s
          Aerial  Antenna
          Aerodrome Airdrome
        Aerofoil Airfoil

          Aeroplane  Airplane
          Aesthete Esthete
          Aesthetic/s Esthetic/s
          Aesthetically Esthetically
          Aether Ether
          Afterwards Afterward
          Ageing  Aging
          Ageism Agism
          Ageist Agist
          Ageless Ageless
          Aggrandise Aggrandize
          Aggrandised Aggrandized
          Aggrandisement Aggrandizement
          Aggrandising Aggrandizing
          Agonise Agonize
          Agonised Agonized
          Agonising Agonizing
          Agonisingly Agonizingly
          Air consignment note Airway bill
          Ajee Agee
          Alcohol Liquor
          All All (of)
          All right Alright
          Allegorisation Allegorization
          Allegorise Allegorize
          Allegorised Allegorized
          Allegorising Allegorizing
          American cloth Oilcloth
          Alphabetise Alphabetize
          Alphabetised Alphabetized
          Alphabetising Alphabetizing
          Alsatian  German shepherd
          Alternative Alternate [sometimes]
          Aluminium  Aluminum
          Alumn?? Alumnus
          Amaze Amaze
          Amazing Amazing
          Amazingly Amazingly
          Amber light Yellow light
          Ambiance Ambience
          American Football Football
          Americanisation Americanization
          Amidship Amidships
          Amoeba Ameba
          Amortiseable Amortizable
          Amortise Amortize
          Amortised Amortized
          Amortising Amortizing
          Amphitheatre Amphitheater

          Anaemia  Anemia
          Anaemic Anemic
          Anaesthetise  Anesthetize
          Anaesthetising Anesthetizing
          Anaesthesia  Anesthesia
          Anaesthetisation Anesthetization
          Anaesthetised Anesthetized
          Analogue  Analog (comp.)
          Analogise Analogize
          Analogising Analogizing
          Analyse  Analyze
          Analysing Analyzing 
          Analyseable Analyzable 
          Anathematise Anathematize 
          Anathematising Anathematizing 
          Anathematisation Anathematization 
          Anatomised Anatomized
          Anatomising Anatomizing
          Anglicised Angilcized
          Anglicising Anglicizing
          Angry Mad
          Annexe/annex  Annex
          Anodise Anodize
          Anorak  Parka
          Answerphone Answering machine
          Antagonise Antagonize
          Antagonising Antagonizing
          Antagonisingly Antagonizingly
          Ante-natal Prenatal
          Anti- [*see anti-]  
          Anti-clockwise Counterclockwise 
          Anti-social Antisocial
          Any more Anymore
          Anywhere Anyplace
          Appal Appall
          Appals Appalls
          Appalled Appalled
          Appalling Appalling
          Apart (~ from) stl. Aside (~ from) stl./apart from
          Apartment hotel  Service flats
          Appeal (against) the Appeal the
          Appetiser Appetizer
          Approved school =  
          Apologise Apologize
          Apologising Apologizing

          Arbour Arbor
          Archaeological Archeological
          Archaeology  Archeology
          Are you through? Are you finished?
          Armed Forces Military
          Armour Armor
          Armoured truck Armored car
          Armoury  Armory
          Army (are) S/P Army (is) S/P
          Artefact  Artifact
          Articulated lorry Tractor-trailer truck
          Ash tray Ash can
          As well Also, too
          At (college) In (college)
          At (school) In (school)
          At (the weekend) On/over (the weekend)
          At (university) At/in (University)
          At (weekends/the weekend) On (weekends/the weekend)
          Attenders Attendees
          Athletics Track and Field
          Athletics team Track team
          Aubergine  Eggplant
          Authorisation Authorization
          Authorise Authorize
          AutocueTM Teleprompter
          Automatisation Automatization
          Autonomous Autonomous

          Autumn  Fall
          Axe  Ax
          Axeing Axing
Have I missed anything? Send in your American/British differences now.


