- Agamas
- Agate
- Age
- Age of shams
- Aged bull
- Ageism
- Agency
- Agent
- Ages
- Agglutinate
- Airsickness
- Air frieght
- Air rifle
- Air service
- Air speed
- Air-conditioning
- Air-cushion
- Air-sea rescue
- Air-to-air
- Airbus
- Aircraft carrier
- Aircraftman
- Airspace
- Airway
- Airwoman
- Airworthiness
- Aka
- Akaru
- Alabama
- Alamode
- Alarmingly
- Alarmist
- Alignment
- Alimony
- Alive and kicking
- Alkali ash
- All -in
- All and sundry
- All around
- All at once
- All for
- All his geese are swans
- All important
- All night
- All one
- Allergic
- Allergic to
- Alley
- Alleyway
- Allied
- Alligator
- Alliteration
- Allopathic
- Allot
- Allow in
- Allowable
- Allowed
- Alloy
- Allure
- Alluring
- Allusion
- Along with
- Alpha
- Alphanumeric
- Also-ran
- Alstonia scholaris
- Amazing
- Ambergris
- Amberite
- Ambidextrous
- Ambience
- Ambiguity
- Ambivalence
- Ambulance
- Amelioration
- Amendment
- Amorphism
- Amorphophallus paeoniifolius
- Amour
- Amour propre
- Amp
- Ampacity
- Ampadi
- Ampersand
- Amphibian
- Amphibious
- Amphorae
- Amputed arm
- Amputee
- Amusedly
- Anachronism
- Anaconda
- Anaesthetic
- Anal sex
- Analects
- Analgesia
- Analog
- Analystic mind
- Analytic
- Anarchic