- Airplane
- Airshaft
- Airy
- Airy-fairy
- Ajar
- Ajmir
- Akimbo
- Akin
- Alacrity
- Aladdin
- Alarm
- Alarmed
- Alike
- Alimentary canal
- Aliquot
- Alkalimeter
- Alkaline salt
- Alkalization
- Alkaloid
- All agog
- All of a shake
- Allergy
- Alleviate
- Alleviation
- Alliance
- Allocation
- Allopath
- Allotment
- Allotropy
- Almanac
- Aloe family
- Alone
- Along
- Along the way
- Alongside
- Aloofness
- Aloplecia
- Aloud
- Alpaca
- Alpha and omega
- Alphabetical
- Alphabetically
- Alphabetize
- Alter ego
- Ambalavasis
- Ambassador
- Amber
- Ambient
- Ambition
- Ambivalent
- Ambivert
- Ambrosia
- Ambulant
- Amchur
- Ameliorable
- Ameliorate
- Amen
- Amenable
- Amend
- Amenity
- Amorphous
- Amphetamine
- Amphiboly
- Ample
- Ampule
- Ampuversary
- Amuse
- Anamnesis
- Anatomical
- Anaerobic
- Anaesthesia
- Anaesthesiologist
- Anaesthetize
- Anal fissure
- Analog computer
- Analysis
- Analyst
- Analystical
- Anantha
- Anarchy
- Anathematize
- Anesthesia
- Anesthsia
- Angered
- Anglo-american
- Anglophile
- Anglophobe
- Annexure
- Annihilate
- Annihilates
- Anniversary
- Anno domini
- Annona
- Annotate
- Announcer
- Annoyed
- Annually
- Annular eclipse
- Anointed
- Anointing