- Asr
- Ass
- Assailant
- Assassin
- 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
- Authoritative dicta
- Authorities
- Authorize
- Auto cad
- Autocratic
- Automated
- Automatic log on
- Automatically
- Autonomous
- Autonomus
- Avoid
- Avouch
- Avowal
- Avowedly
- Avulse
- Avuncular
- Awakening
- Award
- Awfully
- Awkward
- Awoke
- Awry
- Axe
- Axillary bud
- A good while
- A hand-blow
- A hard nut to crack
- A heavy heart
- A hell on earth
- A helping hand
- A hill tribe
- A hit below the belt
- A homely game
- A jain priest
- A lamb to the slaughter
- A lame duck
- A level
- A little
- Admin
- Aberrational
- Abetment
- Abhorrence
- Abide
- Abide way
- Abiding
- Abigail
- Abjudication
- Abjure
- Ablative case
- Ablest
- Ablution
- Ablutophobia
- Abnegate
- Above the weather