- Appointee
- Apportion
- Appraise
- Appraisement
- Appreciable
- Appreciated
- Apprehensible
- Appropriately
- Appropriateness
- Appropriation
- Approver
- Approximate
- Appulse
- Appurtenance
- Apron
- Apsidiole
- Arbour
- Arc
- Arch-vault
- Archdeacon
- Archdiocese
- Archer
- Archetypal
- Archfiend
- Architect
- Architectonic
- Architectural
- Arid land
- Aristocratic families
- Arm -in-arm
- Armageddon
- Armament
- Armful
- Armless
- Armored
- Armorer
- Armory
- Arrows
- Arse over tit
- Arsenic
- Arsis
- Arson
- Art
- Art of creating new meaning by deleting one word
- Art work
- Artesian well
- Articles
- As far as in me lies
- As follows
- As gay as a lark
- As it were
- As much
- As much as
- As never before
- Ascension
- Ascertained
- Ascetics
- 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