A.

Noun

 * 1) absolute temperature
 * 2) absorbance; absorbancy
 * 3) academy; academician
 * acad
 * 1) accommodation
 * 2) accumulator
 * 3) accusative case
 * 4) acid
 * 5) acre; acres
 * A; a.
 * 1) address
 * 2) adjutant
 * 3) administration
 * 4) admiral
 * 5) adult
 * 6) age; aged
 * 7) air
 * 8) air branch
 * 9) aircraft; airplane
 * 10) airman
 * 11) alfa
 * 12) alto
 * 13) amateur
 * a.
 * 1) ambassador
 * 2) America; Americanization
 * Amer.
 * 1)  Amos, the book of
 * 2) amphibian
 * 3) amplitude
 * 4) ana; anna
 * 5) Angstrom
 * Å
 * 1) annus (a year)
 * 2) anode
 * 3) answer
 * ans.; ans; A
 * 1) application
 * 2) apprentice
 * 3) April
 * 4) aqua
 * 5) arctic
 * 6) army
 * 7) article
 * 8) artificer
 * 9) Artillery
 * 10)  assault, as on a badge
 * 11) associate; association
 * 12) Atlantic
 * 13) atomic weight
 * 14) attack
 * 15) August
 * 16) author
 * 17) automobile

Adjective

 * 1) absent
 * 2) Absolute
 * 3) accepted
 * 4) adjusted
 * 5) alto
 * 6) American
 * 7) amphibious
 * 8) anterior
 * 9) approved
 * 10) arctic
 * 11) arterial
 * 12) Asian
 * 13) asked
 * 14) astragal
 * 15) asymmetric
 * 16) atomic
 * 17) Australian
 * 18) auxiliary
 * 19) avancé (fast)

Verb

 * 1) admit
 * 2) Americanize

Preposition

 * 1) after
 * 2) ante (before)
 * 3) at

Adverb

 * 1) annō (in the year)

Abbreviations

 * 1)  ante (“before”)
 * A. D. — ante diem
 * 1)  anno, annus (“year”)
 * A. D. — anno Domini
 * A. U. C. — anno urbis conditae
 * A. P. R. C. — anno post Romam conditam
 * 1) Aulus (a Roman given name)
 * 2) * 4–5, Inscriptiones Orelli 1530: A. A. — Auli duo
 * 3) aquae (“waters”)
 * 4) * Inscriptiones Orelli 1643 sequens; 2620; 3011: A.A. — Aquae Aponi (“Abano Terme”)
 * 5) auro, argento, or aeri (the three directors of the mint)
 * 6) * Inscriptiones Orelli 569; 2242; 2379; 3134 alia: III. VIRI A. A. A. F. F. — auro, argento, aeri flando, feriundo
 * 7) agris (“fields”)
 * A. D. A.  — agris dandis adsignandis
 * A. I. A.  — agris judicandis adsignandis
 * 1)  absolvo (“I free”, “I acquit”)
 * 2)  antiquo — “I leave in its former state”, “I reject” [e.g. the point in question]
 * 3) amicō (“friend”)
 * A. O. — amico optimo — “best friend”
 * 1) a (“of, from”)
 * A. P. — a populo
 * 1) aediliciae
 * A. P. — aediliciae potestatis
 * 1) aerario
 * A. P. R. — aerario populi Romani
 * 1)  adulescens or auditor, one of the disputants, as opposed to M. for magister or Marcus

Proper noun

 * 1) Abdul a male given name