A


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AcronymDefinition
AArea
ABlood Type
AActivity
AApproved
AAccommodation
ABattery Size
AAtomic (as in A-bomb)
AAmpere
AAccusative
AUSDA Grade for Dairy Products and Eggs
AAbout
ATo (Spanish, or from Latin ad)
AAdult
AAre (unit of area)
AAmateur
AYear
AAss
AAccount
AAction
AAdvanced
AIndividual (IRB)
AAdvanced Digital Audio (filename extension)
AFirst in Series (chemistry)
AAway (Sports)
AAuthor
AAssociation
AAsk
AActive
AExcellent (scholastic grade)
AAmerican Bank Note Company (numismatic/philatelic)
AAnna
AAnswer
AArticle
AAccept
AAvailability
AAustria (international car index mark)
AAgency
AAdministration
AAdd(ed) (action code)
AAnnual
AAnalysis
AGMT + 1 hour
AAdvanced Levels (highest level of academic boards, UK)
AAssist (Sports)
AAttack (US military aircraft designation, as in A-10)
AArmy (in combinations only)
AApple
AAgreed To (that an amendment or other matter was approved; US House)
AArmy
AAnonymous
AMass Number (physics)
AAustralian
AAcademy
AAbsolute (degrees Kelvin)
AAnalysis and Assessment (LANL)
AAlpha
AAce
AAutomobile
AAssembly Source Code (Macintosh filename extension)
AAfternoon
AAce (used on playing cards)
AAlto
AAnno
AAnchor (HTML)
AAnalog
AAnalog Signal
AAircraft
AAdjacent (to a carboxyl group; chemistry)
AAqua
AArc
AAtomic Mass
AAggressive Personality Type
AAnnually
AAnterior
AAcre
AArctic
AAnte (Latin: Before)
AAft
AApplet
AAirplane
ASpecific Optical Rotation
aAlgemeen
AArse
AAerial
AAbsent
AAnd
ANewfoundland/Labrador (Canada Post designation)
AAvance (French: fast)
AAllegro (game programming library)
AAlpha Particle
AAuditor
AAtto-
AAcceleration
AAdultery (as in the Scarlet Letter)
AAcronym
AAbbreviation
AArtillery
AArtery
AFirst Substrate
AAmphibian (aircraft type)
AArterial Road (used with road numbers)
AAt or Above (constrained altitude)
AArterial blood
ASpecific Absorption Coefficient
AAirbus
AAmplitude
AAdjective
AArgon
ATotal Acidity
AAsymmetric
ARetinol (vitamin)
AAccumulator
AAutostrada (Italian notation for highways)
AAirman
AAdjutant
AAnode
ASmooth, Paintable (American Plywood Association Veneer Grades)
ADegree of Dissociation
AHelmholtz Energy
AAuris (Latin: ear)
AAlveolar Gas
AAlanine
AAdenosine
AAnimaniacs
AAliphatic Chain (chemistry)
AAngstrom (should be written with Å; unit of length)
AAdenine (one of four DNA building blocks)
AAvianca Airlines (philatelic airmail overprint)
AAbsorbance
AAgouti
AAbsorptance
AAlwaya (dinnerware trademark)
AAdenylic Acid
AAmendment of Application (insurance)
ANucleon Number (physics)
AAromatic Substituent (chemistry)
AAgilent Technologies Incorporated (stock symbol)
AAssisted Citizen (Alabama Public Safety Radio Code)
AStock and Bond Rating
AFederal Reserve Bank of Boston, Massachusetts (designates original spot of circulation of a bill)
AApplanation Tension (pressure in the eye)
ABunsen Solubility Coefficient
AAngle of Asymmetry (NIOSH)
AAssay and Accountability (LANL)
AAutotuned Navaid (aviation navigational aid)
AAktopia
AHighest Level of Division I College Athletics (United States)
AAccelerating Contactor or Relay
ALowest Full-Season Level (minor league baseball)
AUndenominated US Stamp (15 cent, issued 22 May 78)
AAir Force training category (15 days active duty training per year)