AMPS: Automated Meter Posting System
AMS: Address Management System
AMS: Alternate Mailing Systems
AMS2: Address Management System phase 2
AMS3: Address Management System phase 3
AMTES: Area Mail Transport Equipment Specialists
ANK: Attempted Not Known
ANP: After Notice to Proceed
ANSI: American National Standards Institute
ANSI-RIA: American National Standards Institute - Robotics Industries Association
AO: Administrative Official
AO: All Other
AO: Associate Office
AO: Autres Objets
AOG: Aircraft on Ground
AOI: Associate Office Infrastructure
AOS: Advice of Shipment
AP: Accounting Period
APARS: Accounts Payable Accounting and Reporting System
APC: All Purpose Container
APC: Automated Postal Center
API: Application Program Interface
APMG: Assistant Postmaster General
APMG: Associate Postmaster General
APO: Army Post Office
APPS: Automated Package Parcel Sorter
APPS: Automated Package Processing System
APQC: American Productivity and Quality Center
APS: Address Program Support
APS: Adjustment Processing System
APT: Advanced Postal Teller
Apt: Apartment
APT: Automated Postal Teller
APWU: American Postal Workers Union
AR: Account Representative
ARM: Accelerated Reply Mail
ARO: after receipt of order
ARS: Address Recognition System
ARSWS: Address Readability Specialist Work Stations
ARU: Address Recognition Unit