- Asclepias acida
- Ascribe
- Asexual
- Ashamedly
- Ashen
- Ashes
- Ashram
- Asiatic
- Ask
- Assemble
- Assent
- Assessment year
- Assessor
- Asseverate
- Asshole
- Assign
- Assignment
- Assist
- Assistant
- Assistant manager
- Assistant teacher
- Astringent
- Astrological scholar
- Astronomy
- Asura
- Aswathi
- Asymptomatic
- Asynchronous transfer mode
- At
- At a blow
- At a glance
- At a loss
- At ones wits end
- At par
- At point blank range
- At short notice
- At temper
- At the hand of
- At the moment
- At the old school
- At the top of the tree
- Atomize
- Atop
- Atrophy
- Ats
- Attache case
- Attached
- Attacking
- Attagirl
- Attained
- Attaining
- Attainment
- Attempt on the life of
- Au revoir
- Auburn
- Audacity
- Audience hall
- Auditorium
- Auspiciousness
- Auger
- Augment
- Augural
- Auhenticating
- Auntie
- Aura
- Aurora borealis
- Auscultation
- Auspicious function
- Auspicious sound
- Auspicious woman
- Austral
- Autarky
- Authentic
- Authenticity
- Author
- Authoritarian
- Auxiliary
- Avant-garde
- Avaricious person
- Avascular
- Avengeful
- Aversion
- Aversion therapy
- Avian influenza
- Ayacut
- Ayatollah
- Aye
- Ayurvedic treatment
- Ayyappa
- Azimuth
- Azotemia
- Absolutist
- Aero
- A drop in the ocean
- A fair treat
- A feather in one's cap
- A fellow believer
- A few
- A fight to the finish
- A fighting chance