- antemeridian
- antagonistic
- at all costs
- antagonist
- acquainted
- acquit
- ant-lion
- at every turn recurrently
- acrobatics
- at issue
- at large
- ant
- answerable
- at odds in
- anoxia
- at one time previously
- anosmia
- at peak
- at random
- at school
- at sea
- act
- anon
- anomalous
- at someone's disposal
- at someone's disposition
- anole
- at stake
- anointing sick
- addiction
- anoint
- at the end of
- anodyne
- annunciate
- annoy
- announcer
- annotation
- annihilated
- avian influenza
- ankle
- anise seed herb
- anise
- action
- at this rate
- acumen
- at times sometimes
- animated
- atelophobia
- athiest
- athlete
- athletic exercise
- athletics
- atomic
- atomic number
- atomic theory
- atrophy
- animalcule
- animal kingdom
- attachment
- attack
- attagirl
- attained puberty
- attainment
- attempt
- attendance register
- attention
- anguish
- acute
- anglican
- attire
- anger
- attractive
- attributable
- attribute
- angelic
- atwitter
- anesthetic
- anencephalus
- au courant
- audibility
- audible
- audibleness
- audience hall
- acutely
- audio-visual aids
- audiometer
- anemone
- anemic
- augean
- augur
- auld lang syne
- anecdotal
- auricular
- andropogon
- auspicious function
- autodidact
- auspicious woman
- austere
- andropause
- authentically