- As the crow flies
- As thin as a lath
- As usual
- Asafetida
- Asap
- Ascendancy
- Asphalt
- Asphyxia
- Asphyxiator
- Aspirate
- Aspiration
- Aspire
- Asr
- Ass
- Assailant
- Assassin
- Assort
- Assuage
- Assumed
- Assumed name
- Assuming
- Assumption
- Assylum
- Astadyayi
- Asthma
- Astir
- Astral projection
- At all points
- At an alarming rate
- At what time?
- At any place
- At any rate
- At first hand
- At home
- At last
- Attend
- 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
- As such
- Atomism
- Alienist
- Almirah
- Amen!
- Antiquarianism
- Arm
- Atdm
- A