Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym OIS is...

OIS is

Officer Indoctrination School

More Meanings For OIS:

Open Interface Specification
Online Information System
Open Interconnected System
Oh, I See!
Only In Spain
Office of Instructional Services
Oslo International School
Optical Intrinsic Signal
O'Brien Investment Services
OMNI Information Services
Office Information System
Only In Spain
Oil States International
Officer Indoctrination School
Optical Image Stabilizer

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