Angstrom.
Ammeter.
Answer.
Asexual.
Arsehole.
Acre.
Atom.
Adult; as used in film rating.
An assist.
Ace. (including in card games)
The first letter of the English alphabet, called a and written in the Latin script.
Atom; atomic.
The highest letter grade assigned (disregarding plusses and minuses).
Mass number.
A universal affirmative suggestion.
A rank, normally the highest rank, on any of various scales that assign letters.
Allele dominant.
A tone three fifths above C in the cycle of fifths; the sixth tone of the C major scale; the first note of the minor scale of A minor; the reference tone that occurs at exactly 440 Hz; the printed or written note A; the scale with A as its keynote.
A blood type that has a specific antigen that aggravates the immune response in people with type B antigen in their blood. People with this blood type may receive blood from type A or type O but cannot receive blood from AB or B.
Angstrom
apprentice
absorbance; absorbancy
accusative case
amphibian
attack
August
author
automobile
application
Amos, the book of
adjutant
accumulator
acre; acres
ana; anna
April
anode
answer
artificer
air branch
atomic weight
associate; association
academy; academician
age; aged
airman
assault, as on a badge
air
administration
admiral
alfa
amateur
aqua
annus (a year)
Artillery
amplitude
absolute temperature
address
adult
acid
aircraft; airplane
article
Atlantic
arctic
army
accommodation
America; Americanization
ambassador
alto
annō (in the year)
ante (before)
at
after
Americanize
admit
amphibious
avancé (fast)
Asian
asked
Australian
arterial
alto
auxiliary
adjusted
asymmetric
accepted
astragal
anterior
American
arctic
approved
atomic
Absolute
absent