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.