AAONMS – Ancient Arabic Order of the Nobles of the Mystic Shrine
AASR – Ancient and Accepted Scottish Rite (of Freemasons)
AASRFM – Ancient & Accepted Scottish Rite of Freemasonry
AD – anno domini (Latin), in the year of the Lord
AEOS – Ancient Egyptian Order of Sciots (Masons)
AF – Ancestral File, database maintained by the LDS FHL
AF&AM – Ancient, Free, & Accepted Masons
AFAM – Ancient Free and Accepted Mason
AG – Accredited Genealogist (FHL credential)
AGBU – Armenian General Benevolent Union
AHOJB – Ancient and Honorable Order of the Jersey Blues
AISB – Ancient Illuminated Seers of Bavaria
altmat – at liberty to marry (Quaker)
AMORC – Ancient Mystic Order Rosae Crucis
Am. Rev. – American Revolution, American War for Independence
AMVETS – American Veterans
AMOS – Ancient Mystic Order of Samaritans (Odd Fellows)
AOB – Air Order of Battle
AODC – Ancient Order of Degree Coopermen
AOD – Ancient Order of Druids
AOF – Ancient Order of Foresters
AOH – Ancient Order of Hibernians
AOUW – Ancient Order of United Workmen
APCWS – Association for the Preservation of Civil War Sites
apd – attending places of diversion; appointed; appealed (Quaker)
APG – Association of Professional Genealogists
apt – appointed
AQM – Assistant Quartermaster (US Civil War)
AQRS – Assistant Quartermaster Remount Service (US Civil War)
ARC – American Red Cross
ARSS – Antiquariorum Regiae Societatis Socius (Fellow of the Royal Society of Antiquaries)
Art. – Artillery (US military regiments)
ASFD – American Society of Freedmen’s Descendants
ASG – American Society of Genealogists
ASN – Army Serial Number
assn – association
att – attached to; attended (Quaker)
AWOL – Absent Without Leave (military)