- a million times
- a man about town
- a sister's son
- absorbance
- absorptiometer
- absorption band
- assiduously
- air attack
- a specimen
- atomic mass
- atomic weight
- amplitude modulated
- armiger
- alkalaemia
- antiaircraft gun
- archibald percival wavell
- archiannelida
- angiospermy
- aleurone
- apoenzyme
- amyloid
- agamete
- aeciospore
- ameba
- anthophagous
- a paper merchant
- angevin
- angiocarp
- angiospasm
- angel cake
- angel food cake
- aswan high dam
- annunciator
- Acropora
- Actinia
- audiotape storage unit
- audiovisual
- Adiantum capillus_veneris
- Adiantum tenerum
- Adiantum bellum
- American maidenhair fern
- Adiantum pedatum
- alfred thayer mahan
- archegonium
- American hazel
- a superstitious remedy
- andre le notre
- andre malraux
- afghanistani
- anodise
