- alliterate
- ataxia
- aircrew
- anemometer
- allogamy
- alleviation
- absolute alcohol
- aptitude test
- acupuncture
- alphabetical
- antarctica
- atrophied
- at stake
- astigmatism
- agerasia
- atomic pile
- anew
- acetoacetic acid
- androecium
- analgesia
- anuria
- absorbent cotton
- agnosia
- abrogate
- actualize
- air pollution
- amaryllis
- antifreeze
- acreage
- antilogarithm
- aeronaut
- afire
- answer back
- as above
- antihistamine
- anarchism
- anarchic
- antecedents
- at sight
- as soon as
- adrenal cortex
- antemeridian
- ahimsa
- ameliorate
- addle
- appointee
- amnion
- anyway
- addressable
- aerial tramway