- Agamas
- Agate
- Age
- Age of shams
- Aged bull
- Ageism
- Agency
- Agent
- Ages
- Agglutinate
- Airsickness
- Agreed
- Agriculturist
- Agro
- Agroforestry
- Ahalya
- Ahead of
- Ahem
- Ai
- Aid
- Aide
- Aids
- Aileron
- Ailment
- Aimed
- Aimlessly
- Aimlessness
- Airspace
- Airway
- Airwoman
- Airworthiness
- Aka
- Akaru
- Alabama
- Alamode
- Alarmingly
- Alarmist
- All over
- All person
- All right
- All star
- All such
- All the way
- All time
- All-pervading
- All-purpose
- All-wise
- Allayment
- Amatory
- 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
- Anarchical
- Anathema
- Andropogon
- Anechoic
- Anelectorde
- Anesthetized
- Angelic
- Angelica
- Angioplasty
- Angle
- Angle-hook
- Angled hook