- a whole lot of
- a grand old man
- a game akin to polo
- all by oneself
- affirmed
- ascertained
- arikaans
- alarm clock
- a para
- alleluia
- anthem
- a devotional song. hymn
- ataraxia
- an elegy
- a day (comprised of twenty_four hours from sunrise to sunrise)
- a day (extending from sunrise to sunset)
- army base
- adenosine monophosphate
- adenosine triphosphate
- atrophic callus
- antiphonary
- a sequence of hoarse sounds
- acadia national park
- anorthic
- anti_inflammatory action
- a venomous being
- adamss catalyst
- arithmetic picture data
- algebraic eigenvalue problem
- analytical density
- aldermanic
- amunity
- acer saccharinum
- adenoneurohypophysis
- alphatron gauge
- alveolar_artesial oxygen gradient
- alveolar_arterial gas exchange
- alveolar prognathism
- acute pyaemic cholecystitis
- ahriman
- acne erythematosa
- amylene
- anthropical
- arthrotomy
- adenomatous polyp
- asynchronous digital subscriber line
- a ship_ owner
- angle of crossing
- adenosine diphosphate
- abactio mentis