- anesthetist
- angular
- anile
- animadversion
- animadvert
- animate
- ankle joint
- annals
- anno domini
- announce
- annoyance
- annular eclipse
- anode
- anopheles
- another cup of tea
- answer back to
- answer someone back
- answer the door
- antagonism
- antagonize
- ante-room
- anteater
- antedate
- antediluvian
- antelope
- antenatal
- anther
- anther lobe
- anthers
- anthocyanins
- anthropic
- anthropogenic
- anthropologist
- anthropology
- anti-grammatical
- antidote
- antifoundationalism
- antigen
- antihistamines
- antilog
- antimycotic
- antinomy
- antipole
- antiquary
- antiquated
- antiquity
- aorta
- apart
- ape
- apex
- aphonia
- aphorism
- apiary
- apiology
- apnoea
- apolitical
- apostate
- apostatize
- apothecary
- apparel
- appear
- applicant
- application
- application form
- application software
- application window
- applies
- appointed time
- apprehend
- apprehension
- apprenticeship
- apprize
- approbate
- appropriate
- aptitude test
- aquifer
- aquiline
- arabia
- arabian sea
- arable
- ardent spirits
- ardous
- area manager
- areal flood
- areca
- areola
- argon
- argosy
- argot
- arguably
- argument
- armadillo
- armored
- armorer
- armour
- arriviste
- arse over tit
- articulate
- articulated
- artificial insemination