- At times
- At your service
- Atelier
- Atharvaveda
- Athena
- Atherosclerosis
- Athiest
- Athirst
- Athlete
- Athletic exercise
- Athletics
- Athma
- Atmolysis
- Atmospheric pressure
- Attendance
- Attendance register
- Attends
- Attention
- Attention deficit disorder
- Attentively
- Attenuate
- Attest
- Attic
- Attire abode
- Attirement
- Attitude
- Attracted
- Attracting
- Attributable
- Attribute
- Attributes
- Attrition
- Atypical
- 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
- Accentuate
- Accessed
- Accidental
- Accidentality
- Acclamatory shouting
- Acclimatization
- Accommodation
- Actually
- Acumen
- Acute pain
- Ad-lib
- Adagio
- Adams apple
- Adapt to
- Adaptableness
- Adaptation
- Adc
- Admire
- Admiring
- Admissibility
- Admission
- Admitted
- Admixture
- Admonishment
- Adnation
- Ado
- Adobe
- Adopt
- Adoptive
- Adore
- Adventuress
- Adverb
- Adverse
- Advertiser
- Advertisers
- Advertising
- Advised
- Adviser
- Advisers