- Accompanist
- Accord
- According as
- Accountancy
- Accountant
- Accoutre
- Accoutrement
- Accreditation
- Acetylene
- Acheron
- Achievable
- Achieve wonders
- Achieved
- Achievement
- Achromatic
- Achyranthus aspera
- Acia
- Airsick
- Acidify
- Acme
- Aconite
- Acquaintance
- Actualist
- Acquaintanceship
- Acquiesce
- Acquisitive
- Acquittal
- Acre
- Acrimonious
- Acrobatic
- Acrobatics
- Acropolis
- Across
- Act of grace
- Actuarial
- Actuary
- Actuate
- Acuate
- Acupuncture
- Ad hoc
- Ad infinitum
- Adamantine
- Adapt
- Adapter
- Add fuel to the fire
- Add insult to injury
- Add operator
- Addict
- Addition
- Additive month
- Address bus
- Address oneself to
- Addressing
- Admirable
- Admiral
- Admiration
- Admirer
- Admiringly
- Admit of
- Adolescent
- Adoption
- Adventurism
- Adversary
- Adversely
- Advertisement
- Advice
- Advisement
- Advisory committee
- Advocate
- Aerate
- Aerial
- Afganisthan
- Aerobics
- Aerodrome
- Aerogram
- Aeronomy
- Aesthete
- Aesthetical
- Aetiology
- Affability
- Affably
- Affaiars
- Affair
- Affaire de coeur
- Affect
- Affected
- Affectedness
- Afoot
- Aforementioned
- Afraid of his own shadow
- Afrikaans
- After
- After a fashion
- After petticoat
- After that
- Afterbirth
- Afterglow
- Aftermath
- Against
- Against time