- Ash-coloured
- Ash-pit
- Ashamed
- Ashtray
- Asinine
- Assemblage
- Assembly
- Assertive
- Assertively
- Assertiveness
- Assiduity
- Assiduous
- Assiduously
- Assimilate
- Assisting
- Astro
- Astrobotany
- Astrolabe
- Astrological
- Astrology
- Astronomer
- Astronomical
- Astrophysics
- Asunder
- Aswamedha
- Asylum
- Asymmetry
- At a snails pace
- At a stretch
- At a tender age
- At all events
- At dead of night
- At first
- At loggerheads
- At work
- At-the-outset
- Ataraxy
- Ataxia
- Athenaeum
- Athletic
- Atmospheric air
- Atomic power
- Attentiveness
- Attenuation
- Attested
- Atticism
- Attorney
- Attractive
- Attribution
- Aural
- Aureole
- Auricular
- Aurora australis
- Auspice
- Auspicious
- Auspicious time
- Austerity
- Authenticated
- Author of atharva veda
- Authoratative treatise
- Authoress
- Avocado
- Avocation
- Avoidable
- Avoidance
- Avoiding
- Avow
- Awaken
- Awakened
- Aware
- Away
- Awed
- Awkwardness
- Awning
- Agoraphobic
- Avoirdupois
- Amaranthus
- Antiquary
- Auctor
- A disciple who lodges with his preceptor
- A divine ministrel
- A dogs life
- A dry
- A false alarm
- A fiche
- A fish
- A floating voter
- A form of verse in which each line contains eight letters
- A golden parachute
- A good innings
- A good thing
- A grain of paddy
- A hollow laugh
- A host in himself
- A jam session
- A kings ransom
- A lack all
- A laughing stock
- A lazy susan
- A little water