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OAI abbr.
abbr.	Open Archives Initiative; Open Applications Interface; Outside Air Intake
abbr., adv.	Outdoor Advertising, Inc.
abbr., auto.	outside air induction
abbr., avia.	omnidirectional airspeed indicator
abbr., el.	off-axis illumination; open application interface; optical analytic instrument; Optical Associates, Inc.
abbr., IT	Organizational Assessment Inventory
abbr., libr.	Open Archive Initiatives
abbr., mil.	oceanographic area of interest
abbr., mil., avia.	Office of Aeronautical Intelligence
abbr., oil	on-line analog input; oxygen activation count-rate
abbr., pharm.	official action indicated (fda.gov Rada0414)
abbr., post	Office of Automation Integration
abbr., tradem.	Optical Associates Incorporated
OAI erroneously, instead of AAI abbr.
abbr., min.proc.	AAI (MichaelBurov); Audibert–Arnu index (MichaelBurov); Audibert–Arnu dilatometer test index (MichaelBurov)
min.proc.	Audibert–Arnu dilatometer test index (MichaelBurov); Audibert–Arnu index (MichaelBurov)